diff --git a/bridges/bridge_softmix.c b/bridges/bridge_softmix.c
index f490967e2aca2bc751edc1ca8057fee237c0c28c..8de88f257ca88350108e2bcab9299255a2992646 100644
--- a/bridges/bridge_softmix.c
+++ b/bridges/bridge_softmix.c
@@ -541,6 +541,8 @@ static int append_all_streams(struct ast_stream_topology *dest,
 			dest_index++;
 
 			if (ast_stream_get_state(stream) == AST_STREAM_STATE_REMOVED) {
+				/* This cannot fail because dest_index - 1 is less than the
+				 * current count in dest. */
 				ast_stream_topology_set_stream(dest, dest_index - 1, clone);
 				added = 1;
 				break;