diff --git a/doc/effective_go.html b/doc/effective_go.html
index bc70b0c8e3..731959e408 100644
--- a/doc/effective_go.html
+++ b/doc/effective_go.html
@@ -1521,7 +1521,7 @@ for i := range picture {
 <p>
 Maps are a convenient and powerful built-in data structure that associate
 values of one type (the <em>key</em>) with values of another type
-(the <em>element</em> or <em>value</em>)
+(the <em>element</em> or <em>value</em>).
 The key can be of any type for which the equality operator is defined,
 such as integers,
 floating point and complex numbers,