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diff --git a/docs/index.html b/docs/index.html
index 400ceb1..73753d7 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -1008,6 +1008,7 @@
                 <li><tt>nil, "killed"</tt> if forcefully killed.</li>
                 <li>The return values of the lane function. If the first return value is <tt>nil</tt> (or there is no return value), an error is raised, to make sure you can tell timeout and error cases apart from successful return.</li>
         </ul>
+        If the lane handle obtained from <tt>lanes.gen()</tt> is to-be-closed, closing the value will cause a call to <tt>join()</tt>. Since it is implicit, the lane body isn't forced to return non-<tt>nil</tt> in that case.
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