diff --git a/contrib/numpy/index.md b/contrib/numpy/index.md
index c6bf23c..5d3f63b 100644
--- a/contrib/numpy/index.md
+++ b/contrib/numpy/index.md
@@ -1,3 +1,3 @@
 # List of sections
 
-- [Introduction](Introduction.md)
+- [Introduction](introduction.md)