diff --git a/reflector/Callsign.cpp b/reflector/Callsign.cpp
index b36874f..3defe45 100644
--- a/reflector/Callsign.cpp
+++ b/reflector/Callsign.cpp
@@ -23,7 +23,7 @@
 #include "DMRIdDirHttp.h"
 #include "Callsign.h"
 
-// if a client is using special characters ',', '-' or '/', he's out of luck!
+// if a client is using special characters '.', '-' or '/', he's out of luck!
 #define M17CHARACTERS " ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-/."
 
 ////////////////////////////////////////////////////////////////////////////////////////