diff --git a/TODO-RELEASE b/TODO-RELEASE
index 472b32867..648b6a6d8 100644
--- a/TODO-RELEASE
+++ b/TODO-RELEASE
@@ -2,4 +2,5 @@
 libosmogsm	internal API update	Internal API for GPRS cipher implementors updated to accommodate for arbitrary key lengths
 libosmocore	change major	external talloc dependency / internal talloc removal
 libosmocore	change major	size of ph_data_param struct changed / Extend L1SAP PH-DATA with presence information
-libosmocore	change major	size of ph_data_param struct changed / Extend L1SAP PH-DATA with measurement information
\ No newline at end of file
+libosmocore	change major	size of ph_data_param struct changed / Extend L1SAP PH-DATA with measurement information
+libosmocore	change major	size of ph_tch_param struct changed / Extend with RTP Marker
diff --git a/include/osmocom/gsm/l1sap.h b/include/osmocom/gsm/l1sap.h
index f0e9f6c9c..e199efe12 100644
--- a/include/osmocom/gsm/l1sap.h
+++ b/include/osmocom/gsm/l1sap.h
@@ -81,6 +81,7 @@ struct ph_tch_param {
 	uint8_t chan_nr;	/*!< \brief Channel Number (Like RSL) */
 	uint32_t fn;		/*!< \brief GSM Frame Number */
 	int8_t rssi;		/*!< \brief RSSI of received indication */
+	uint8_t marker;		/*!< \brief RTP Marker bit (speech onset indicator) */
 };
 
 /*! \brief for PH-CONN.ind */