diff --git a/README.md b/README.md
index 9b6d3e4..854bbff 100644
--- a/README.md
+++ b/README.md
@@ -5,3 +5,5 @@ Experiments with ReadTheDocs
 https://simonw-readthedocs-experiments.readthedocs.io/
 
 This edit should update /en/latest/ but not change /en/stable/
+
+Adding `!stable-docs` to a commit message should trigger an update of `stable-docs`.