diff --git a/runtime/doc/channel.txt b/runtime/doc/channel.txt
index 65dbd30..5b4ea2b 100644
--- a/runtime/doc/channel.txt
+++ b/runtime/doc/channel.txt
@@ -27,6 +27,7 @@
 14. Using a prompt buffer		|prompt-buffer|
 15. Language Server Protocol		|language-server-protocol|
 
+							*E1277*
 {only when compiled with the |+channel| feature for channel stuff}
 	You can check this with: `has('channel')`
 {only when compiled with the |+job| feature for job stuff}