diff --git a/docs/tutorial/LangImpl4.html b/docs/tutorial/LangImpl4.html
index 8661b62..8c25a04 100644
--- a/docs/tutorial/LangImpl4.html
+++ b/docs/tutorial/LangImpl4.html
@@ -360,7 +360,7 @@
 
 <div class="doc_code">
 <pre>
-ready&gt; def testfunc(x y) x + y*2; </b> 
+ready&gt; <b>def testfunc(x y) x + y*2; </b> 
 Read function definition:
 define double @testfunc(double %x, double %y) {
 entry: