diff --git a/errata.html b/errata.html
index 876bd1e..749309c 100644
--- a/errata.html
+++ b/errata.html
@@ -30,6 +30,11 @@ pre {
   </p>
   <pre>rand.Seed(time.Now().UTC().UnixNano())</pre>
 
+  <p>
+    <b>p.15, ¶2</b>: For "inner loop", read "outer loop".
+    (Thanks to Ralph Corderoy, 2015-11-28.)
+  </p>
+
   <p>
     <b>p.19, ¶2</b>: For "Go's libraries makes", read "Go's library makes".
     (Thanks to Victor Farazdagi, 2015-11-30.)