diff --git a/doc/go1.9.html b/doc/go1.9.html
index 3e7f1477c9c..5c877bc4c93 100644
--- a/doc/go1.9.html
+++ b/doc/go1.9.html
@@ -798,7 +798,7 @@ CL 40331: https://golang.org/cl/40331: cmd/link,runtime/cgo: enable PT_TLS gener
       <a href="/pkg/time/#Duration.Round"><code>Duration.Round</code></a>
       and 
       <a href="/pkg/time/#Duration.Truncate"><code>Duration.Truncate</code></a>
-      handle rounding durations away from and towards zero, respectively.
+      handle rounding and truncating durations to multiples of a given duration.
     </p>
 
     <p><!-- CL 35710 -->