Update project-settings.md

docs/en/manuals/project-settings.md

@@ -71,7 +71,7 @@ Which render setup file to use, which defines the render pipeline, `/builtins/re
 ### Library
 
 #### Include Dirs
-A space separated list of directories that should be shared from your project via library sharing.
+A space separated list of directories that should be shared from your project via library sharing. Refer to the [Libraries manual](/manuals/libraries/) for more information.
 
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