1 files changed, 1 insertions, 0 deletions

diff --git a/list.h b/list.h
index 06f97f2..0baca25 100644
--- a/list.h
+++ b/list.h
@@ -1,3 +1,4 @@
+// references:
 // "C Primer Plus" Chapter17 practice 17 practice problem 2
 
 /*list.h--简单列表类型的头文件*/