diff --git a/src/dict.c b/src/dict.c
index a00341d354..69ea252550 100644
--- a/src/dict.c
+++ b/src/dict.c
@@ -137,6 +137,7 @@ uint64_t dictGenCaseHashFunction(const unsigned char *buf, size_t len) {
 #define ENTRY_PTR_NORMAL 0   /* 000 */
 #define ENTRY_PTR_NO_VALUE 2 /* 010 */
 #define ENTRY_PTR_EMBEDDED 4 /* 100 */
+/*      ENTRY_PTR_IS_KEY        xx1 */
 
 /* Returns 1 if the entry pointer is a pointer to a key, rather than to an
  * allocated entry. Returns 0 otherwise. */