Document a use-case of PatchSetLock
Change-Id: Ic44bdc4ee27cd868a4077c7ea38226dd29dad8df
diff --git a/Documentation/config-labels.txt b/Documentation/config-labels.txt
index 3db621d..1aa6cd7c 100644
--- a/Documentation/config-labels.txt
+++ b/Documentation/config-labels.txt
@@ -238,7 +238,9 @@
The `PatchSetLock` function provides a locking mechanism for patch
sets. This function's values are not considered when determining
whether a change is submittable. When set, no new patchsets can be
-created and rebase and abandon are blocked.
+created and rebase and abandon are blocked. This is useful to prevent
+updates to a change while (potentially expensive) CI
+validation is running.
+
This function is designed to allow overlapping locks, so several lock
accounts could lock the same change.
