diff --git a/library/RSL_Types.ttcn b/library/RSL_Types.ttcn
index 3c2db73..f8b66c6 100644
--- a/library/RSL_Types.ttcn
+++ b/library/RSL_Types.ttcn
@@ -1140,6 +1140,19 @@
 		}
 	}
 
+	/* 8.6.20 BTS <- BSC */
+	template RSL_Message ts_RSL_SACCH_INF_MOD(RslChannelNr chan_nr, RSL_IE_SysinfoType si_type,
+						  octetstring l3_info) := {
+		msg_disc := ts_RSL_MsgDisc(RSL_MDISC_DCHAN, false),
+		msg_type := RSL_MT_SACCH_INFO_MODIFY,
+		ies := {
+			t_RSL_IE(RSL_IE_CHAN_NR, RSL_IE_Body:{chan_nr := chan_nr}),
+			t_RSL_IE(RSL_IE_SYSINFO_TYPE, RSL_IE_Body:{sysinfo_type := si_type}),
+			t_RSL_IE(RSL_IE_L3_INFO, RSL_IE_Body:{l3_info := ts_RSL_L16V(l3_info)})
+		}
+	}
+
+
 	/* COMMON CHANNEL MANAGEMENT MESSAGES */
 
 	/* 8.5.1 BTS <- BSC */