diff --git a/doc/go_spec.html b/doc/go_spec.html
index 797e4038f04..abb1735e859 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -5101,8 +5101,9 @@ Implementation restriction: A compiler may restrict ImportPaths to
 non-empty strings using only characters belonging to
 <a href="http://www.unicode.org/versions/Unicode6.0.0/">Unicode's</a>
 L, M, N, P, and S general categories (the Graphic characters without
-spaces) and may also exclude the ASCII characters
-<code>!"#$%&amp;'()*,:;&lt;=&gt;?[\]^`{|}</code>.
+spaces) and may also exclude the characters
+<code>!"#$%&amp;'()*,:;&lt;=&gt;?[\]^`{|}</code>
+and the Unicode replacement character U+FFFD.
 </p>
 
 <p>