diff --git a/docs/heapprofile.html b/docs/heapprofile.html
index 3986a25..6f50869 100644
--- a/docs/heapprofile.html
+++ b/docs/heapprofile.html
@@ -114,6 +114,15 @@ environment variables.</p>
   </td>
 </tr>
 
+<tr valign=top>
+  <td><code>HEAPPROFILESIGNAL</code></td>
+  <td>default: disabled</td>
+  <td>
+    Dump heap profiling information whenever the specified signal is sent to the
+    process.
+  </td>
+</tr>
+
 <tr valign=top>
   <td><code>HEAP_PROFILE_MMAP</code></td>
   <td>default: false</td>