3 files changed, 30 insertions, 0 deletions
diff --git a/src/crepe/system/PhysicsSystem.h b/src/crepe/system/PhysicsSystem.h
index cc13b70..cb6160e 100644
--- a/src/crepe/system/PhysicsSystem.h
+++ b/src/crepe/system/PhysicsSystem.h
@@ -1,6 +1,7 @@
 #pragma once
 
 namespace crepe {
+
 /**
  * \brief System that controls all physics
  * 
diff --git a/src/crepe/system/ScriptSystem.h b/src/crepe/system/ScriptSystem.h
index f3d26d4..9d57640 100644
--- a/src/crepe/system/ScriptSystem.h
+++ b/src/crepe/system/ScriptSystem.h
@@ -8,12 +8,31 @@ namespace crepe {
 
 class Script;
 
+/**
+ * \brief Script system
+ * 
+ * The script system is responsible for all \c BehaviorScript components, and
+ * calls the methods on classes derived from \c Script.
+ */
 class ScriptSystem : public System {
 public:
+	/**
+	 * \brief Call Script::update() on all active \c BehaviorScript instances
+	 *
+	 * This routine updates all scripts sequentially using the Script::update()
+	 * method. It also calls Script::init() if this has not been done before on
+	 * the \c BehaviorScript instance.
+	 */
 	void update();
 
 private:
 	// TODO: to forward_list<reference_wrapper>
+	/**
+	 * \brief Aggregate all active \c BehaviorScript components and return a list
+	 * of references to their \c Script instances (utility)
+	 *
+	 * \returns List of active \c Script instances
+	 */
 	std::forward_list<Script *> get_scripts() const;
 };
 
diff --git a/src/crepe/system/System.h b/src/crepe/system/System.h
index 3b81bef..ec4507f 100644
--- a/src/crepe/system/System.h
+++ b/src/crepe/system/System.h
@@ -2,8 +2,18 @@
 
 namespace crepe {
 
+/**
+ * \brief Base ECS system class
+ *
+ * This class is used as the base for all system classes. Classes derived from
+ * System must implement the System::update() method and copy Script::Script
+ * with the `using`-syntax.
+ */
 class System {
 public:
+	/**
+	 * \brief Process all components this system is responsible for.
+	 */
 	virtual void update() = 0;
 
 public: