diff --git a/zuul.yaml b/zuul.yaml
index 6b06c8519e..070684f968 100644
--- a/zuul.yaml
+++ b/zuul.yaml
@@ -24,15 +24,16 @@
         comment: false
     success:
       gerrit:
+        # Note that gerrit keywords are case-sensitive.
         Verified: 1
       github:
-          status: 'success'
+        status: 'success'
       mysql:
     failure:
       gerrit:
         Verified: -1
       github:
-          status: 'failure'
+        status: 'failure'
       mysql:
 
 - pipeline: