diff --git a/docs/tutorial/LangImpl3.html b/docs/tutorial/LangImpl3.html
index 3e62928..8e9ed1f 100644
--- a/docs/tutorial/LangImpl3.html
+++ b/docs/tutorial/LangImpl3.html
@@ -91,7 +91,7 @@
 <p>Note that instead of adding virtual methods to the ExprAST class hierarchy,
 it could also make sense to use a visitor pattern or some other way to model
 this.  Again, this tutorial won't dwell on good software engineering practices:
-for our purposes, adding virtual methods is simplest.</p>
+for our purposes, adding a virtual method is simplest.</p>
 
 <p>The
 second thing we want is an "Error" method like we used for parser, which will