diff --git a/src/quicklist.h b/src/quicklist.h
index dc30cafd9..8d6951b62 100644
--- a/src/quicklist.h
+++ b/src/quicklist.h
@@ -116,7 +116,7 @@ typedef struct quicklist {
 typedef struct quicklistIter {
     quicklist *quicklist;
     quicklistNode *current;
-    unsigned char *zi;
+    unsigned char *zi; /* points to the current element */
     long offset; /* offset in current listpack */
     int direction;
 } quicklistIter;
@@ -141,7 +141,7 @@ typedef struct quicklistEntry {
 /* quicklist compression disable */
 #define QUICKLIST_NOCOMPRESS 0
 
-/* quicklist container formats */
+/* quicklist node container formats */
 #define QUICKLIST_NODE_CONTAINER_PLAIN 1
 #define QUICKLIST_NODE_CONTAINER_PACKED 2