diff --git a/common/protocols.h b/common/protocols.h
index 98cb68fa8..82cea74ad 100644
--- a/common/protocols.h
+++ b/common/protocols.h
@@ -178,7 +178,7 @@ ISO 7816-4 Basic interindustry commands. For command APDU's.
 #define MIFARE_ULEV1_CHECKTEAR	0x3E
 #define MIFARE_ULEV1_VCSL		0x4B
 
-# New Mifare UL Nano commands.  Ref:: (https://www.nxp.com/docs/en/data-sheet/MF0UN_H_00.pdf)
+// New Mifare UL Nano commands.  Ref:: (https://www.nxp.com/docs/en/data-sheet/MF0UN_H_00.pdf)
 #define MIFARE_ULNANO_WRITESIG	0xA9
 #define MIFARE_ULNANO_LOCKSIF	0xAC