diff --git a/README.md b/README.md
index 1fdfe3e..ba91c34 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,6 @@
 # GG
 
-controller emulator
\ No newline at end of file
+controller emulator
+
+## External sources
+- https://github.com/gialexpro/XMouse