diff --git a/development/add-on-core-functionality.mdx b/development/add-on-core-functionality.mdx
index e2963e5..c6c3143 100644
--- a/development/add-on-core-functionality.mdx
+++ b/development/add-on-core-functionality.mdx
@@ -16,7 +16,7 @@ The first thing to do is to make sure that CMAKE is able to see and add your add
 ```cpp
 add_executable(${PROJECT_NAME}
 ...
-src/addons/addon_name.cpp
+src/addons/addon_name.h
 ...
 )
 
@@ -202,4 +202,4 @@ enum AddonEnum
 // addonOptions.addonNameOptions
 INIT_UNSET_PROPERTY(config.addonOptions.addonNameOptions, enabled, ADDON_NAME_ENABLED);
 
-```
\ No newline at end of file
+```