diff --git a/pjsip/include/pjsua-lib/pjsua.h b/pjsip/include/pjsua-lib/pjsua.h
index 6014c957d4..89ebad68ff 100644
--- a/pjsip/include/pjsua-lib/pjsua.h
+++ b/pjsip/include/pjsua-lib/pjsua.h
@@ -5623,8 +5623,7 @@ typedef struct pjsua_call_send_dtmf_param
     pjsua_dtmf_method method;
 
     /**
-     * The signal duration used for the DTMF. This field is only used
-     * if the method is PJSUA_DTMF_METHOD_SIP_INFO.
+     * The signal duration used for the DTMF.
      *
      * Default: PJSUA_CALL_SEND_DTMF_DURATION_DEFAULT
      */
diff --git a/pjsip/include/pjsua2/call.hpp b/pjsip/include/pjsua2/call.hpp
index d37df81b02..743da677ac 100644
--- a/pjsip/include/pjsua2/call.hpp
+++ b/pjsip/include/pjsua2/call.hpp
@@ -1355,8 +1355,7 @@ struct CallSendDtmfParam
     pjsua_dtmf_method method;    
 
     /**
-     * The signal duration used for the DTMF. This field is only used
-     * if the method is PJSUA_DTMF_METHOD_SIP_INFO.
+     * The signal duration used for the DTMF.
      *
      * Default: PJSUA_CALL_SEND_DTMF_DURATION_DEFAULT
      */