diff --git a/src/rdb.c b/src/rdb.c
index 23dc8983..6bfa0039 100644
--- a/src/rdb.c
+++ b/src/rdb.c
@@ -705,8 +705,13 @@ int rdbSaveAuxFieldStrInt(rio *rdb, char *key, long long val) {
 
 /* Save a few default AUX fields with information about the RDB generated. */
 int rdbSaveInfoAuxFields(rio *rdb) {
+    int redis_bits = (sizeof(void*) == 8) ? 64 : 32;
+
+    /* Add a few fiels about the state when the RDB was created. */
     if (rdbSaveAuxFieldStrStr(rdb,"redis-ver",REDIS_VERSION) == -1) return -1;
+    if (rdbSaveAuxFieldStrInt(rdb,"redis-bits",redis_bits) == -1) return -1;
     if (rdbSaveAuxFieldStrInt(rdb,"ctime",time(NULL)) == -1) return -1;
+    if (rdbSaveAuxFieldStrInt(rdb,"used-mem",zmalloc_used_memory()) == -1) return -1;
     return 1;
 }