1 files changed, 1 insertions, 1 deletions
diff --git a/ll.h b/ll.h
index 9a80182..cea6010 100644
--- a/ll.h
+++ b/ll.h
@@ -7,6 +7,6 @@ typedef struct llnode {
     struct llnode* next;
 } llnode;
 
-llnode* appendll(llnode* tail, char* str);
+llnode* appendll(llnode* tail, /*@notnull@*/char* str);
 
 #endif