diff --git a/README.md b/README.md
index 4f2529454..380b7fabf 100644
--- a/README.md
+++ b/README.md
@@ -28,7 +28,7 @@ This method won't work natively on Windows, however. Refer to the [installation
 
 ## Developer guide
 
-See the [developer guide](CONTRIBUTING) for instructions on contributing code to ffsim.
+See the [developer guide](CONTRIBUTING.md) for instructions on contributing code to ffsim.
 
 ## Citing ffsim