diff --git a/doc/go_spec.html b/doc/go_spec.html
index 561d44271a2..b59b37fd552 100644
--- a/doc/go_spec.html
+++ b/doc/go_spec.html
@@ -1,6 +1,6 @@
 <!--{
 	"Title": "The Go Programming Language Specification",
-	"Subtitle": "Version of Jun 2, 2021",
+	"Subtitle": "Version of Jun 22, 2021",
 	"Path": "/ref/spec"
 }-->
 
@@ -4670,7 +4670,7 @@ The following built-in functions are not permitted in statement context:
 
 <pre>
 append cap complex imag len make new real
-unsafe.Alignof unsafe.Offsetof unsafe.Sizeof
+unsafe.Add unsafe.Alignof unsafe.Offsetof unsafe.Sizeof unsafe.Slice
 </pre>
 
 <pre>