diff --git a/include/ucore/mbuf.h b/include/ucore/mbuf.h
index 3cf45cd..256354a 100644
--- a/include/ucore/mbuf.h
+++ b/include/ucore/mbuf.h
@@ -17,7 +17,8 @@ enum UC_MBUF_FLAGS {
 };
 
 struct MBuf {
-    /** next pointer, user can use this for a linked list*/
+    /** prev/next pointer, user can use this for a linked list*/
+    struct MBuf *prev;
     struct MBuf *next;
     /** Pointers the user can use to remember spots in
      * the data. (these must either be NULL pointers or point into