diff --git a/WHATS_NEW_DM b/WHATS_NEW_DM
index e11ebcb51..416becab1 100644
--- a/WHATS_NEW_DM
+++ b/WHATS_NEW_DM
@@ -1,5 +1,6 @@
 Version 1.02.76 - 
 ===============================
+  Add support for thin pool message release/reserve_metadata_snap.
   Add support for thin pool discard and external origin.
   Add configure --enable-udev-rule-exec-detection to detect exec path in rules.
   Use sbindir in udev rules by default and remove executable path detection.
diff --git a/libdm/libdevmapper.h b/libdm/libdevmapper.h
index 6eeaf8752..549a6355c 100644
--- a/libdm/libdevmapper.h
+++ b/libdm/libdevmapper.h
@@ -650,6 +650,8 @@ typedef enum {
 	DM_THIN_MESSAGE_CREATE_THIN,		/* device_id */
 	DM_THIN_MESSAGE_DELETE,			/* device_id */
 	DM_THIN_MESSAGE_SET_TRANSACTION_ID,	/* current_id, new_id */
+	DM_THIN_MESSAGE_RESERVE_METADATA_SNAP,	/* 1.1 */
+	DM_THIN_MESSAGE_RELEASE_METADATA_SNAP,	/* 1.1 */
 } dm_thin_message_t;
 
 int dm_tree_node_add_thin_pool_message(struct dm_tree_node *node,
diff --git a/libdm/libdm-deptree.c b/libdm/libdm-deptree.c
index a43b6a21c..acd82cacf 100644
--- a/libdm/libdm-deptree.c
+++ b/libdm/libdm-deptree.c
@@ -1411,6 +1411,12 @@ static int _thin_pool_node_message(struct dm_tree_node *dnode, struct thin_messa
 				m->u.m_set_transaction_id.current_id,
 				m->u.m_set_transaction_id.new_id);
 		break;
+	case DM_THIN_MESSAGE_RESERVE_METADATA_SNAP: /* 1.1 */
+		r = dm_snprintf(buf, sizeof(buf), "reserve_metadata_snap");
+		break;
+	case DM_THIN_MESSAGE_RELEASE_METADATA_SNAP: /* 1.1 */
+		r = dm_snprintf(buf, sizeof(buf), "release_metadata_snap");
+		break;
 	default:
 		r = -1;
 	}