diff --git a/2012/tromp/how.html b/2012/tromp/how.html
index b8055c516..a2fc23917 100644
--- a/2012/tromp/how.html
+++ b/2012/tromp/how.html
@@ -383,7 +383,7 @@
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
 <!-- BEFORE: 1st line of markdown file: 2012/tromp/how.md -->
-<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge</h3>
+<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
 <p><strong>If you want a greater challenge, don’t read any further</strong>:
 just try to understand the program via the source.</p>
 <p>If you get stuck, come back and read below for additional hints and information.</p>
diff --git a/2014/endoh1/quine-qr.html b/2014/endoh1/quine-qr.html
index 1ffee4f40..5b88b11fe 100644
--- a/2014/endoh1/quine-qr.html
+++ b/2014/endoh1/quine-qr.html
@@ -383,7 +383,7 @@
 <!-- START: this line starts content for HTML phase 21 by: bin/pandoc-wrapper.sh via bin/md2html.sh -->
 
 <!-- BEFORE: 1st line of markdown file: 2014/endoh1/quine-qr.md -->
-<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge</h3>
+<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
 <p><strong>If you want a greater challenge, don’t read any further</strong>:
 just try to understand the program via the source.</p>
 <p>If you get stuck, come back and read below for additional hints and information.</p>