diff --git a/book/src/chapter_1.md b/book/src/chapter_1.md
index 9071257..8c51402 100644
--- a/book/src/chapter_1.md
+++ b/book/src/chapter_1.md
@@ -14,8 +14,8 @@
 ### eliminate
 
 ### obliterate
-[etymonline.com / obliterate](https://www.etymonline.com/word/obliterate)
-[merriam-webster.com / obliterate](https://www.merriam-webster.com/dictionary/obliterate)
+#### [etymonline.com / obliterate](https://www.etymonline.com/word/obliterate)
+#### [merriam-webster.com / obliterate](https://www.merriam-webster.com/dictionary/obliterate)
 
 ![obliterate by years](images/obliterate/years.png)