diff --git a/doc/go1.13.html b/doc/go1.13.html
index 34a2d5e043..bc44531133 100644
--- a/doc/go1.13.html
+++ b/doc/go1.13.html
@@ -105,6 +105,11 @@ Do not send CLs removing the interior tags from such phrases.
   Go 1.13 is the last release that will run on Native Client (NaCl).
 </p>
 
+<p><!-- CL 170119, CL 168882 -->
+  For <code>GOARCH=wasm</code>, the new environment variable <code>GOWASM</code> takes a comma-separated list of experimental features that the binary gets compiled with.
+  The valid values are documented <a href="/cmd/go/#hdr-Environment_variables">here</a>.
+</p>
+
 <h3 id="aix">AIX</h3>
 
 <p><!-- CL 164003, CL 169120 -->