diff --git a/mobs/messages.rb b/mobs/messages.rb
index 60a7de03b..dbff393e0 100644
--- a/mobs/messages.rb
+++ b/mobs/messages.rb
@@ -258,6 +258,7 @@ message 38, 'CSSDeleteRule' do
   uint 'Index'
 end
 
+# deprecated since 4.1.10 in favor of NetworkRequest
 message 39, 'Fetch', :replayer => :devtools do
   string 'Method'
   string 'URL'