diff --git a/exercises/13/README.md b/exercises/13/README.md
index ed030c2..1b419a6 100644
--- a/exercises/13/README.md
+++ b/exercises/13/README.md
@@ -1,3 +1,3 @@
 [< Back](../README.md)
 
-* [Exercise: Create an isWall function](create_function/exercise.md)
+* [Exercise: Create an isWall function](create_function/README.md)