diff --git a/website/source/docs/templates/push.html.markdown b/website/source/docs/templates/push.html.markdown
index b46bef3e8..efc6029cb 100644
--- a/website/source/docs/templates/push.html.markdown
+++ b/website/source/docs/templates/push.html.markdown
@@ -38,7 +38,8 @@ each category, the available configuration keys are alphabetized.
 ### Required
 
 -   `name` (string) - Name of the build configuration in the build service. If
-    this doesn't exist, it will be created (by default).
+    this doesn't exist, it will be created (by default). Note that the name can
+    cannot contain dots. `[a-zA-Z0-9-_]+` are safe.
 
 ### Optional