diff --git a/_100-days-of-code/2018-01-01-100-days-of-code-day013.markdown b/_100-days-of-code/2018-01-01-100-days-of-code-day013.markdown
index 1ba4025..5cc4305 100644
--- a/_100-days-of-code/2018-01-01-100-days-of-code-day013.markdown
+++ b/_100-days-of-code/2018-01-01-100-days-of-code-day013.markdown
@@ -1,6 +1,6 @@
 ---
 layout: post
-title:  "day 12"
+title:  "day 13"
 date:  2018-01-19
 categories: programming
 ---