diff --git a/Test.gd b/Test.gd
index 9e15cf1..e12fd0e 100644
--- a/Test.gd
+++ b/Test.gd
@@ -43,6 +43,8 @@ Type (technical)   = %type_technical%
 Typerelease        = %release_type%
 Development mode   = %devmode%
 Headless mode      = %headless%"""))
+	# Print hi
+	core.logger.info("Hi there!")
 
 # Update CORE configuration
 func configure_core() -> void:
diff --git a/docs/docs/about.md b/docs/docs/about.md
index 825f73f..70e3d1b 100644
--- a/docs/docs/about.md
+++ b/docs/docs/about.md
@@ -16,4 +16,4 @@ If you want to use the CORE Framework in a new project, then your answer is **ye
 - [x] Logger implementation
 - [ ] HTTP Request helper
 - [ ] Mod Loader
-- [ ] Support for custom modules
\ No newline at end of file
+- [x] Support for custom modules
diff --git a/docs/docs/reference/api/core.md b/docs/docs/reference/api/core.md
index 7ba0f37..670f779 100644
--- a/docs/docs/reference/api/core.md
+++ b/docs/docs/reference/api/core.md
@@ -26,10 +26,14 @@ Stores the path to CORE's installation directory.
 
 ## Functions
 ### *void* <u>_init</u>(*CoreConfiguration* <u>new_config</u>)
-:::note
-This function will be called when calling `CORE.new()`.
-:::
 Determines the base path, loads the configuration file and initializes all modules.
+### *void* <u>register_custom_module</u>(*String* <u>module_name</u>, *CoreBaseModule* <u>module_class</u>)
+Registers a custom module.
+### *void* <u>unregister_custom_module</u>(*String* <u>module_name</u>)
+Unregisters a custom module.
+### *CoreBaseModule* <u>get_custom_module</u>(*String* <u>module_name</u>)
+Returns a registered custom module. \
+Please note that you can't get CORE's builtin modules with this function.
 ### *void* <u>reload_configuration</u>(*CoreConfiguration* <u>new_config</u>)
 Loads a new CoreConfiguration class and applies it's settings.
 ### *bool* <u>is_devmode</u>()
diff --git a/src/core.gd b/src/core.gd
index e66d7f0..1eae33d 100644
--- a/src/core.gd
+++ b/src/core.gd
@@ -30,13 +30,14 @@ const version_type: CoreTypes.VersionType = CoreTypes.VersionType.ALPHA
 const version_typerelease: int = 0
 
 # Modules
-var config: CoreConfiguration
 var logger: CoreBaseModule
 var misc: CoreBaseModule
 var logui: CoreBaseModule
 
 # Variables
 var basepath: String
+var config: CoreConfiguration
+var custom_modules: Dictionary = {}
 
 # Preinitialization
 func _init(new_config: CoreConfiguration = CoreConfiguration.new()) -> void:
@@ -82,6 +83,32 @@ func inject_modules() -> void:
 	add_child(misc)
 	add_child(logui)
 
+# Registers a custom module
+func register_custom_module(module_name: String, module_class: CoreBaseModule) -> void:
+	logger.verb("Registering new custom module \"" + module_name + "\"")
+	if custom_modules.has(module_name):
+		logger.error("Registering module failed: A custom module with the name \"" + module_name + "\" already exists.")
+		return
+	custom_modules.merge({ module_name: module_class })
+	module_class._initialize()
+	module_class._pull_config()
+
+# Unregisters a custom module
+func unregister_custom_module(module_name: String) -> void:
+	logger.verb("Unregistering custom module \"" + module_name + "\"")
+	if !custom_modules.has(module_name):
+		logger.error("Unregistering module failed: A custom module with the name \"" + module_name + "\" does not exist.")
+		return
+	custom_modules.erase(module_name)
+
+# Returns a custom module
+func get_custom_module(module_name: String) -> CoreBaseModule:
+	logger.diag("Getting custom module \"" + module_name + "\"")
+	if !custom_modules.has(module_name):
+		logger.error("Getting module failed: A custom module with the name \"" + module_name + "\" does not exist.")
+		return
+	return custom_modules[module_name]
+
 # (Re-)Load configuration
 func reload_configuration(new_config: CoreConfiguration = CoreConfiguration.new()) -> void:
 	var initialized = config != null