diff --git a/_posts/2023-09-19-microcontroller-peripheral-interface-guide.md b/_posts/2023-09-19-microcontroller-peripheral-interface-guide.md
index 8c4a60d..8f8f7c9 100644
--- a/_posts/2023-09-19-microcontroller-peripheral-interface-guide.md
+++ b/_posts/2023-09-19-microcontroller-peripheral-interface-guide.md
@@ -15,4 +15,4 @@ Additionally, we would like to introduce libraries developed by enthusiastic con
 
 # mruby, mruby/c Common I/O API Guidelines
 
-https://github.com/mruby/microcontroller-peripheral-interface-guide
+[https://github.com/mruby/microcontroller-peripheral-interface-guide](https://github.com/mruby/microcontroller-peripheral-interface-guide)
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