diff --git a/book/src/ruby/builtin_types.md b/book/src/ruby/builtin_types.md
index 1a136ae..0bb57e1 100644
--- a/book/src/ruby/builtin_types.md
+++ b/book/src/ruby/builtin_types.md
@@ -1,27 +1,27 @@
 # Builtin types
 
-bevy_scriptum provides following types that can be used in Lua:
+bevy_scriptum provides following types that can be used in Ruby:
 
-- ```Vec3```
-- ```BevyEntity```
+- ```Bevy::Vec3```
+- ```Bevy::Entity```
 
 ## Vec3
 
-### Constructor
+### Class Methods
 
-`Vec3(x: number, y: number, z: number)`
+- `new(x, y, z)`
+- `current`
 
-### Properties
+### Instance Methods
 
-- `x: number`
-- `y: number`
-- `z: number`
+- `x`
+- `y`
+- `z`
 
+### Example Ruby usage
 
-### Example Lua usage
-
-```lua
-my_vec = Vec3(1, 2, 3)
+```ruby
+my_vec = Bevy::Vec3.new(1, 2, 3)
 set_translation(entity, my_vec)
 ```
 
@@ -33,12 +33,12 @@ set_translation(entity, my_vec)
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
              runtime.add_function(String::from("set_translation"), set_translation);
         })
         .run();
@@ -63,11 +63,11 @@ None - instances can only be acquired by using built-in `entity` global variable
 
 - `index: integer`
 
-### Example Lua usage
+### Example Ruby usage
 
-```lua
-print(entity.index)
-pass_to_rust(entity)
+```ruby
+puts(Bevy::Entity.current.index)
+pass_to_rust(Bevy::Entity.current)
 ```
 
 ### Example Rust usage
@@ -78,12 +78,12 @@ pass_to_rust(entity)
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
              runtime.add_function(String::from("pass_to_rust"), |In((entity,)): In<(BevyEntity,)>| {
                println!("pass_to_rust called with entity: {:?}", entity);
              });
diff --git a/book/src/ruby/builtin_variables.md b/book/src/ruby/builtin_variables.md
index 558aa39..2896ecf 100644
--- a/book/src/ruby/builtin_variables.md
+++ b/book/src/ruby/builtin_variables.md
@@ -2,12 +2,12 @@
 
 ## entity
 
-A variable called `entity` is automatically available to all scripts - it represents bevy entity that the `Script` component is attached to.
-It exposes `index` property that returns bevy entity index.
+Current entity that the script is atteched to can be retrieved by calling `Bevy::Entity.current`.
+It exposes `index` method that returns bevy entity index.
 It is useful for accessing entity's components from scripts.
 It can be used in the following way:
-```lua
-print("Current entity index: " .. entity.index)
+```ruby
+puts("Current entity index: #{Bevy::Entity.current.index}")
 ```
 
-`entity` variable is currently not available within promise callbacks.
+`Bevy::Entity.current` variable is currently not available within promise callbacks.
diff --git a/book/src/ruby/calling_rust_from_script.md b/book/src/ruby/calling_rust_from_script.md
index de90227..f4520fb 100644
--- a/book/src/ruby/calling_rust_from_script.md
+++ b/book/src/ruby/calling_rust_from_script.md
@@ -1,6 +1,6 @@
-# Calling Rust from Lua
+# Calling Rust from Ruby
 
-To call a rust function from Lua first you need to register a function
+To call a rust function from Ruby first you need to register a function
 within Rust using builder pattern.
 
 ```rust,no_run
@@ -9,12 +9,12 @@ within Rust using builder pattern.
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
             // `runtime` is a builder that you can use to register functions
         })
         .run();
@@ -29,12 +29,12 @@ For example to register a function called `my_rust_func` you can do the followin
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
              runtime.add_function(String::from("my_rust_func"), || {
                println!("my_rust_func has been called");
              });
@@ -43,15 +43,12 @@ fn main() {
 }
 ```
 
-After you do that the function will be available to Lua code in your spawned scripts.
+After you do that the function will be available to Ruby code in your spawned scripts.
 
-```lua
-my_rust_func()
+```ruby
+my_rust_func
 ```
 
-Registered functions can also take parameters. A parameter can be any type
-that implements `FromLua`.
-
 Since a registered callback function is a Bevy system, the parameters are passed
 to it as `In` struct with tuple, which has to be the first parameter of the closure.
 
@@ -61,12 +58,12 @@ to it as `In` struct with tuple, which has to be the first parameter of the clos
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
              runtime.add_function(String::from("func_with_params"), |args: In<(String, i64)>| {
                println!("my_rust_func has been called with string {} and i64 {}", args.0.0, args.0.1);
              });
@@ -83,12 +80,12 @@ To make it look nicer you can destructure the `In` struct.
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
              runtime.add_function(String::from("func_with_params"), |In((a, b)): In<(String, i64)>| {
                println!("my_rust_func has been called with string {} and i64 {}", a, b);
              });
@@ -97,9 +94,9 @@ fn main() {
 }
 ```
 
-The above function can be called from Lua
+The above function can be called from Ruby
 
-```lua
+```ruby
 func_with_params("abc", 123)
 ```
 
@@ -115,12 +112,12 @@ a callback that will receive the value returned from Rust function.
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
              runtime.add_function(String::from("returns_value"), || {
                 123
              });
@@ -129,8 +126,8 @@ fn main() {
 }
 ```
 
-```lua
-returns_value():and_then(function (value)
-    print(value) -- 123
-end)
+```ruby
+returns_value.and_then do |value|
+    puts(value) # 123
+end
 ```
diff --git a/book/src/ruby/calling_script_from_rust.md b/book/src/ruby/calling_script_from_rust.md
index c42fb08..6fcd068 100644
--- a/book/src/ruby/calling_script_from_rust.md
+++ b/book/src/ruby/calling_script_from_rust.md
@@ -1,15 +1,15 @@
-# Calling Lua from Rust
+# Calling Ruby from Rust
 
-To call a function defined in Lua
+To call a function defined in Ruby
 
-```lua
-function on_update()
+```ruby
+def on_update
 end
 ```
 
-We need to acquire `LuaRuntime` resource within a bevy system.
+We need to acquire `RubyRuntime` resource within a bevy system.
 Then we will be able to call `call_fn` on it, providing the name
-of the function to call, `LuaScriptData` that has been automatically
+of the function to call, `RubyScriptData` that has been automatically
 attached to entity after an entity with script attached has been spawned
 and its script evaluated, the entity and optionally some arguments.
 
@@ -19,14 +19,14 @@ and its script evaluated, the entity and optionally some arguments.
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
-fn call_lua_on_update_from_rust(
-    mut scripted_entities: Query<(Entity, &mut LuaScriptData)>,
-    scripting_runtime: ResMut<LuaRuntime>,
+fn call_ruby_on_update_from_rust(
+    mut scripted_entities: Query<(Entity, &mut RubyScriptData)>,
+    scripting_runtime: ResMut<RubyRuntime>,
 ) {
     for (entity, mut script_data) in &mut scripted_entities {
-        // calling function named `on_update` defined in lua script
+        // calling function named `on_update` defined in Ruby script
         scripting_runtime
             .call_fn("on_update", &mut script_data, entity, ())
             .unwrap();
@@ -43,11 +43,11 @@ We can also pass some arguments by providing a tuple or `Vec` as the last
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
-fn call_lua_on_update_from_rust(
-    mut scripted_entities: Query<(Entity, &mut LuaScriptData)>,
-    scripting_runtime: ResMut<LuaRuntime>,
+fn call_ruby_on_update_from_rust(
+    mut scripted_entities: Query<(Entity, &mut RubyScriptData)>,
+    scripting_runtime: ResMut<RubyRuntime>,
 ) {
     for (entity, mut script_data) in &mut scripted_entities {
         scripting_runtime
@@ -57,13 +57,10 @@ fn call_lua_on_update_from_rust(
 }
 ```
 
-They will be passed to `on_update` Lua function
-```lua
-function on_update(a, b)
-    print(a) -- 123
-    print(b) -- hello
+They will be passed to `on_update` Ruby function
+```ruby
+def on_update(a, b)
+    puts(a) # 123
+    puts(b) # hello
 end
 ```
-
-Any type that implements `IntoLua` can be passed as an argument withing the
-tuple in `call_fn`.
diff --git a/book/src/ruby/hello_world.md b/book/src/ruby/hello_world.md
index a271b2e..b16f780 100644
--- a/book/src/ruby/hello_world.md
+++ b/book/src/ruby/hello_world.md
@@ -18,12 +18,12 @@ You can now start exposing functions to the scripting language. For example, you
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
            runtime.add_function(
                String::from("my_print"),
                |In((x,)): In<(String,)>| {
@@ -35,9 +35,9 @@ fn main() {
 }
 ```
 
-Then you can create a script file in `assets` directory called `script.lua` that calls this function:
+Then you can create a script file in `assets` directory called `script.rb` that calls this function:
 
-```lua
+```ruby
 my_print("Hello world!")
 ```
 
@@ -49,12 +49,12 @@ And spawn an entity with attached `Script` component with a handle to a script s
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
            runtime.add_function(
                String::from("my_print"),
                |In((x,)): In<(String,)>| {
@@ -63,7 +63,7 @@ fn main() {
            );
         })
         .add_systems(Startup,|mut commands: Commands, asset_server: Res<AssetServer>| {
-            commands.spawn(Script::<LuaScript>::new(asset_server.load("script.lua")));
+            commands.spawn(Script::<RubyScript>::new(asset_server.load("script.rb")));
         })
         .run();
 }
diff --git a/book/src/ruby/installation.md b/book/src/ruby/installation.md
index 4caaac9..a23325c 100644
--- a/book/src/ruby/installation.md
+++ b/book/src/ruby/installation.md
@@ -5,7 +5,7 @@ Add the following to your `Cargo.toml`:
 ```toml
 [dependencies]
 bevy = "0.16"
-bevy_scriptum = { version = "0.8", features = ["lua"] }
+bevy_scriptum = { version = "0.8", features = ["ruby"] }
 ```
 
 If you need a different version of bevy you need to use a matching bevy_scriptum
diff --git a/book/src/ruby/interacting_with_bevy.md b/book/src/ruby/interacting_with_bevy.md
index 96aad07..0fe5e9a 100644
--- a/book/src/ruby/interacting_with_bevy.md
+++ b/book/src/ruby/interacting_with_bevy.md
@@ -14,7 +14,7 @@ of all entities with `Player` component.
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 #[derive(Component)]
 struct Player;
@@ -22,7 +22,7 @@ struct Player;
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
             runtime.add_function(
                 String::from("print_player_names"),
                 |players: Query<&Name, With<Player>>| {
@@ -38,8 +38,8 @@ fn main() {
 
 In script:
 
-```lua
-print_player_names()
+```ruby
+print_player_names
 ```
 
 You can use functions that interact with Bevy entities and resources and
@@ -53,7 +53,7 @@ component.
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 #[derive(Component)]
 struct Player {
@@ -63,7 +63,7 @@ struct Player {
 fn main() {
     App::new()
         .add_plugins(DefaultPlugins)
-        .add_scripting::<LuaRuntime>(|runtime| {
+        .add_scripting::<RubyRuntime>(|runtime| {
             runtime.add_function(
                 String::from("hurt_player"),
                 |In((hit_value,)): In<(i32,)>, mut players: Query<&mut Player>| {
@@ -78,6 +78,6 @@ fn main() {
 
 And it could be called in script like:
 
-```lua
+```ruby
 hurt_player(5)
 ```
diff --git a/book/src/ruby/lua.md b/book/src/ruby/lua.md
deleted file mode 100644
index 891ffd4..0000000
--- a/book/src/ruby/lua.md
+++ /dev/null
@@ -1,3 +0,0 @@
-# Lua
-
-This chapter demonstrates how to work with bevy_scriptum when using Lua language runtime.
diff --git a/book/src/ruby/ruby.md b/book/src/ruby/ruby.md
index 99ea45d..1eb429f 100644
--- a/book/src/ruby/ruby.md
+++ b/book/src/ruby/ruby.md
@@ -1 +1,3 @@
 # Ruby
+
+This chapter demonstrates how to work with bevy_scriptum when using Ruby language runtime.
diff --git a/book/src/ruby/spawning_scripts.md b/book/src/ruby/spawning_scripts.md
index 8acd82d..9466733 100644
--- a/book/src/ruby/spawning_scripts.md
+++ b/book/src/ruby/spawning_scripts.md
@@ -9,18 +9,18 @@ bevy's `AssetServer`.
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn my_spawner(mut commands: Commands, assets_server: Res<AssetServer>) {
-    commands.spawn(Script::<LuaScript>::new(
-        assets_server.load("my_script.lua"),
+    commands.spawn(Script::<RubyScript>::new(
+        assets_server.load("my_script.rb"),
     ));
 }
 ```
 
 After they scripts have been evaled by bevy_scriptum, the entities that they've
-been attached to will get the `Script::<LuaScript>` component stripped and instead
-```LuaScriptData``` component will be attached.
+been attached to will get the `Script::<RubyScript>` component stripped and instead
+```RubyScriptData``` component will be attached.
 
 So to query scipted entities you could do something like:
 
@@ -30,10 +30,10 @@ So to query scipted entities you could do something like:
 
 use bevy::prelude::*;
 use bevy_scriptum::prelude::*;
-use bevy_scriptum::runtimes::lua::prelude::*;
+use bevy_scriptum::runtimes::ruby::prelude::*;
 
 fn my_system(
-    mut scripted_entities: Query<(Entity, &mut LuaScriptData)>,
+    mut scripted_entities: Query<(Entity, &mut RubyScriptData)>,
 ) {
     for (entity, mut script_data) in &mut scripted_entities {
         // do something with scripted entities
diff --git a/src/runtimes/ruby.rs b/src/runtimes/ruby.rs
index 2f3f7f5..b41262e 100644
--- a/src/runtimes/ruby.rs
+++ b/src/runtimes/ruby.rs
@@ -174,7 +174,7 @@ fn then(r_self: magnus::Value) -> magnus::Value {
         .into_value()
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 #[magnus::wrap(class = "Bevy::Entity")]
 pub struct BevyEntity(pub Entity);
 
@@ -191,7 +191,7 @@ impl TryConvert for BevyEntity {
     }
 }
 
-#[derive(Clone)]
+#[derive(Clone, Debug)]
 #[magnus::wrap(class = "Bevy::Vec3")]
 pub struct BevyVec3(pub Vec3);