diff --git a/pkgs/by-name/sa/sage/README.md b/pkgs/by-name/sa/sage/README.md
index 94a9b0b6bc29..80e09a0d8616 100644
--- a/pkgs/by-name/sa/sage/README.md
+++ b/pkgs/by-name/sa/sage/README.md
@@ -26,7 +26,7 @@ Then make the needed changes and generate a patch with `git diff`:
 
 ```
 [user@localhost ~]$ <make changes>
-[user@localhost ~]$ git diff -u > /path/to/nixpkgs/pkgs/applications/science/math/sage/patches/name-of-patch.patch
+[user@localhost ~]$ git diff -u > /path/to/nixpkgs/pkgs/by-name/sa/sage/patches/name-of-patch.patch
 ```
 
 Now just add the patch to `sage-src.nix` and test your changes. If they fix the problem, submit a PR upstream (refer to sages [Developer's Guide](http://doc.sagemath.org/html/en/developer/index.html) for further details).