diff --git a/include/gsup_protocol.hrl b/include/gsup_protocol.hrl
index e304654..3c867d6 100644
--- a/include/gsup_protocol.hrl
+++ b/include/gsup_protocol.hrl
@@ -198,9 +198,9 @@
   16#28 => #{message_type => mt_forward_sm_req, mandatory => [sm_rp_mr, sm_rp_da, sm_rp_oa, sm_rp_ui], optional => [sm_rp_mms]},
   16#29 => #{message_type => mt_forward_sm_err, mandatory => [sm_rp_mr, sm_rp_cause], optional => [sm_rp_ui]},
   16#2a => #{message_type => mt_forward_sm_res, mandatory => [sm_rp_mr], optional => [sm_rp_ui]},
-  16#2c => #{message_type => ready_for_sm_req, mandatory => [sm_alert_reason]},
-  16#2d => #{message_type => ready_for_sm_err, mandatory => [sm_rp_cause], optional => [sm_rp_ui]},
-  16#2e => #{message_type => ready_for_sm_res, mandatory => []},
+  16#2c => #{message_type => ready_for_sm_req, mandatory => [sm_rp_mr, sm_alert_reason]},
+  16#2d => #{message_type => ready_for_sm_err, mandatory => [sm_rp_mr, sm_rp_cause], optional => [sm_rp_ui]},
+  16#2e => #{message_type => ready_for_sm_res, mandatory => [sm_rp_mr]},
   16#30 => #{message_type => check_imei_req, mandatory => [imei]},
   16#31 => #{message_type => check_imei_err, mandatory => [cause]},
   16#32 => #{message_type => check_imei_res, mandatory => [imei_check_result]},