diff --git a/pkgs/README.md b/pkgs/README.md
index 1d8d62e640db..694de2858e43 100644
--- a/pkgs/README.md
+++ b/pkgs/README.md
@@ -125,7 +125,7 @@ To add a package to Nixpkgs:
    - Apache HTTPD: [`pkgs/servers/http/apache-httpd/2.4.nix`](servers/http/apache-httpd/2.4.nix).
      A bunch of optional features, variable substitutions in the configure flags, a post-install hook, and miscellaneous hackery.
 
-   - buildMozillaMach: [`pkgs/applications/networking/browser/firefox/common.nix`](applications/networking/browsers/firefox/common.nix).
+   - buildMozillaMach: [`pkgs/build-support/build-mozilla-mach/default.nix`](./build-support/build-mozilla-mach/default.nix).
      A reusable build function for Firefox, Thunderbird and Librewolf.
 
    - JDiskReport, a Java utility: [`pkgs/by-name/jd/jdiskreport/package.nix`](./by-name/jd/jdiskreport/package.nix).