diff --git a/README.md b/README.md
index 162dd87..a8b8d4f 100644
--- a/README.md
+++ b/README.md
@@ -4,6 +4,7 @@
 **What's this about ?**
 
 Anyone can contribute resources like exercises, learning materials & sources here. Contribute to the solution & share their individual code.
+If you have other source of exercises, put it under external_source.
 
 **How it works ?**