diff --git a/README.md b/README.md
index b18e5ffc414450f69d3c688d6d2bf36ece6bcade..ef74cd0643753dc01e287b10003b8847510e0148 100644
--- a/README.md
+++ b/README.md
@@ -166,7 +166,9 @@ $ nix build -f ./. --arg ghc "(import ghc-from-source.nix {ghc-path=$GHC_TREE;})
 
 GHC's GitLab instance uses GitLab CI and the `head-hackage-ci` tool (contained
 in the `ci/` directory) to test the `head.hackage` patchset against GHC releases
-and snapshots.
+and snapshots. It can also compile head.hackage using a patch to GHC; just add
+the `user-facing` label to a GHC MR, and the existing CI infrastructure will
+invoke head.hackage.
 
 To run a similar build locally start by downloading and installing a binary
 distribution appropriate for your distribution and then call the `run-ci` script: