diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 6ec8897030..4eba133f5e 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -794,7 +794,7 @@ struct sip_auth {
 #define SIP_PAGE2_CALL_ONHOLD		(3 << 23)	/*!< Call states */
 #define SIP_PAGE2_CALL_ONHOLD_ONEDIR	(1 << 23)	/*!< 23: One directional hold */
 #define SIP_PAGE2_CALL_ONHOLD_INACTIVE	(1 << 24)	/*!< 24: Inactive  */
-#define SIP_PAGE2_RFC2833_COMPENSATE    (1 << 25)	/*!< 25: ???? */
+#define SIP_PAGE2_RFC2833_COMPENSATE    (1 << 25)	/*!< 25: Compensate for buggy RFC2833 implementations */
 #define SIP_PAGE2_BUGGY_MWI		(1 << 26)	/*!< 26: Buggy CISCO MWI fix */
 #define SIP_PAGE2_NOTEXT		(1 << 27)	/*!< 27: Text not supported  */
 #define SIP_PAGE2_TEXTSUPPORT		(1 << 28)	/*!< 28: Global text enable */