diff --git a/ct/headers/mattermost b/ct/headers/mattermost
new file mode 100644
index 00000000..1fc67ba3
--- /dev/null
+++ b/ct/headers/mattermost
@@ -0,0 +1,6 @@
+    __  ___      __  __                                 __ 
+   /  |/  /___ _/ /_/ /____  _________ ___  ____  _____/ /_
+  / /|_/ / __ `/ __/ __/ _ \/ ___/ __ `__ \/ __ \/ ___/ __/
+ / /  / / /_/ / /_/ /_/  __/ /  / / / / / / /_/ (__  ) /_  
+/_/  /_/\__,_/\__/\__/\___/_/  /_/ /_/ /_/\____/____/\__/  
+