diff --git a/doc/contribute.html b/doc/contribute.html
index aee044acae..c419557208 100644
--- a/doc/contribute.html
+++ b/doc/contribute.html
@@ -386,7 +386,8 @@ Unless explicitly told otherwise, such as in the discussion leading
 up to sending in the change list, it's better not to specify a reviewer.
 All changes are automatically CC'ed to the
 <a href="https://groups.google.com/group/golang-codereviews">golang-codereviews@googlegroups.com</a>
-mailing list.
+mailing list. If this is your first ever change, there may be a moderation
+delay before it appears on the mailing list, to prevent spam.
 </p>
 
 <p>