diff --git a/FAQ.md b/FAQ.md
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--- a/FAQ.md
+++ b/FAQ.md
@@ -1,5 +1,11 @@
 ## Something doesn't work
 First create a basic configuration following https://github.com/42wim/matterbridge/wiki/How-to-create-your-config
+
+## Slack
+### Messages come from Slack API tester
+Did you set `RemoteNickFormat`?
+Try adding `RemoteNickFormat="<{NICK}>"`
+
 ## Gitter
 ### Messages deleted on gitter aren't deleted on other bridges
 Gitter doesn't send delete events to their API, so we can't pick those up.