1 files changed, 1 insertions, 0 deletions

diff --git a/list.c b/list.c
index 49aeaac..d2547c4 100644
--- a/list.c
+++ b/list.c
@@ -1,3 +1,4 @@
+// references:
 // "C Primer Plus" Chapter17 practice 17 practice problem 2
 
 //list.c--支持列表操作的函数