diff --git a/cmd/src/extensions.go b/cmd/src/extensions.go
index 89010e9740..9f2aebbe4c 100644
--- a/cmd/src/extensions.go
+++ b/cmd/src/extensions.go
@@ -18,6 +18,7 @@ Usage:
 
 The commands are:
 
+	copy       copy an extension from Sourcegraph.com to your private extension registry
 	publish    publish the extension in the current directory
 	list       lists extensions
 	get        gets an extension