diff --git a/doc/heapprofile.html b/doc/heapprofile.html
index e9f6b15..5c64c9b 100644
--- a/doc/heapprofile.html
+++ b/doc/heapprofile.html
@@ -122,7 +122,7 @@ environment variables.</p>
 </tr>
 
 <tr valign=top>
-  <td><code>HEAP_PROFILE_MMAP_ONLY</code></td>
+  <td><code>HEAP_PROFILE_ONLY_MMAP</code></td>
   <td>default: false</td>
   <td>
     Only profile <code>mmap</code>, <code>mremap</code>, and <code>sbrk</code>