diff --git a/doc/go_spec.html b/doc/go_spec.html
index b25cf5fa6e..6f4aefcf4f 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -820,7 +820,8 @@ An alias denotes a named type if the type given in the alias declaration is a na
 
 <p>
 Each type <code>T</code> has an <i>underlying type</i>: If <code>T</code>
-is one of the predeclared boolean, numeric, or string types, or a type literal,
+is one of the predeclared boolean, numeric, or string types, the predeclared
+type <code>comparable</code>, or a type literal,
 the corresponding underlying type is <code>T</code> itself.
 Otherwise, <code>T</code>'s underlying type is the underlying type of the
 type to which <code>T</code> refers in its <a href="#Type_declarations">type