diff --git a/src/QBar/Host.hs b/src/QBar/Host.hs
index 3a78f21d30fa351cfed0fd947b17bcb279b8d201..748ae734827e39e8948837615ac45210901052b2 100644
--- a/src/QBar/Host.hs
+++ b/src/QBar/Host.hs
@@ -137,6 +137,7 @@ filterDuplicates = do
 followupEventWaitTime :: BlockUpdateReason -> Int
 followupEventWaitTime DefaultUpdate = 10000
 followupEventWaitTime PullUpdate = 50000
+-- 'followupEventWaitTime' for 'UserUpdate' has to be zero, or blocks would be blocked blocked for this time when sending a 'UserUpdate'.
 followupEventWaitTime UserUpdate = 0
 
 followupEventWaitTimeDefault :: Int