note that order of = items is undefined, probably
diff --git a/lib/linklist.c b/lib/linklist.c
index d6eeab4..9c1b297 100644
--- a/lib/linklist.c
+++ b/lib/linklist.c
@@ -85,6 +85,10 @@
* cmp function, insert a new node with the given val such that the
* list remains sorted. The new node is always inserted; there is no
* notion of omitting duplicates.
+ *
+ * XXX not sure this is right:
+ * It is currently undefined whether new nodes for which cmp returns 0
+ * should be added before or after any existing nodes.
*/
void
listnode_add_sort (struct list *list, void *val)