diff --git a/doc/container_concept.htm b/doc/container_concept.htm
index 2613b6fe..141f4e1a 100644
--- a/doc/container_concept.htm
+++ b/doc/container_concept.htm
@@ -110,7 +110,7 @@ Dense Vector ONLY. The type of underlying storage array used to store the elemen
 <td>Storage</td>
 <td><code>v.data()</code></td>
 <td><code>v</code> is mutable and Dense.</td>
-<td><code>array_type&amp;</code> if a is mutable, <code>const array_type&amp;</code> otherwise</td>
+<td><code>array_type&amp;</code> if <code>v</code> is mutable, <code>const array_type&amp;</code> otherwise</td>
 </tr>
 </tbody>
 </table>
@@ -307,7 +307,7 @@ following expressions must be valid.</p>
 <td>Storage</td>
 <td><code>m.data()</code></td>
 <td><code>m</code> is mutable and Dense.</td>
-<td><code>array_type&amp;</code> if a is mutable, <code>const array_type&amp;</code> otherwise</td>
+<td><code>array_type&amp;</code> if <code>m</code> is mutable, <code>const array_type&amp;</code> otherwise</td>
 </tr>
 </tbody>
 </table>