diff --git a/src/redis.h b/src/redis.h
index b7f4ce37..34692a95 100644
--- a/src/redis.h
+++ b/src/redis.h
@@ -272,6 +272,7 @@ typedef long long mstime_t; /* millisecond time type. */
 #define REDIS_REPL_NONE 0 /* No active replication */
 #define REDIS_REPL_CONNECT 1 /* Must connect to master */
 #define REDIS_REPL_CONNECTING 2 /* Connecting to master */
+/* --- Handshake states, must be ordered --- */
 #define REDIS_REPL_RECEIVE_PONG 3 /* Wait for PING reply */
 #define REDIS_REPL_SEND_AUTH 4 /* Send AUTH to master */
 #define REDIS_REPL_RECEIVE_AUTH 5 /* Wait for AUTH reply */
@@ -280,6 +281,7 @@ typedef long long mstime_t; /* millisecond time type. */
 #define REDIS_REPL_SEND_CAPA 8 /* Send REPLCONF capa */
 #define REDIS_REPL_RECEIVE_CAPA 9 /* Wait for REPLCONF reply */
 #define REDIS_REPL_SEND_PSYNC 10 /* Send PSYNC */
+/* --- End of handshake states --- */
 #define REDIS_REPL_RECEIVE_PSYNC 11 /* Wait for PSYNC reply */
 #define REDIS_REPL_TRANSFER 12 /* Receiving .rdb from master */
 #define REDIS_REPL_CONNECTED 13 /* Connected to master */