diff --git a/bedstead.c b/bedstead.c
index 737bbcd..40ab55b 100644
--- a/bedstead.c
+++ b/bedstead.c
@@ -3592,7 +3592,7 @@ dogsub(void)
 	printf("  </FeatureList>\n");
 	printf("  <LookupList>\n");
 	for (i = 0; i < ngsub_features; i++) {
-		printf("    <Lookup>\n");
+		printf("    <Lookup> <!-- '%s' -->\n", gsub_features[i].tag);
 		if (gsub_features[i].suffix != NULL) {
 			/* Single lookup for all glyphs with a suffix. */
 			TTXI("LookupType", 1);