diff --git a/doc/langref.html.in b/doc/langref.html.in
index 300a21fc106b4516865f942724e28cd4d4882354..d20b9d4d5b10a82b3a4776eec61b4f27eeb53ecb 100644
--- a/doc/langref.html.in
+++ b/doc/langref.html.in
@@ -2199,7 +2199,7 @@ unwrapped == 1234{#endsyntax#}</pre>
           </td>
           <td>
             <pre>{#syntax#}const value: ?u32 = null;
-value == null{#endsyntax#}</pre>
+(value == null) == true{#endsyntax#}</pre>
           </td>
         </tr>
         <tr>
@@ -2220,6 +2220,21 @@ value == null{#endsyntax#}</pre>
             <pre>{#syntax#}(1 != 1) == false{#endsyntax#}</pre>
           </td>
         </tr>
+        <tr>
+          <th scope="row"><pre>{#syntax#}a != null{#endsyntax#}</pre></th>
+          <td>
+            <ul>
+              <li>{#link|Optionals#}</li>
+            </ul>
+          </td>
+          <td>
+              Returns {#syntax#}false{#endsyntax#} if a is {#syntax#}null{#endsyntax#}, otherwise returns {#syntax#}true{#endsyntax#}.
+          </td>
+          <td>
+            <pre>{#syntax#}const value: ?u32 = null;
+(value != null) == false{#endsyntax#}</pre>
+          </td>
+        </tr>
         <tr>
           <th scope="row"><pre>{#syntax#}a > b{#endsyntax#}</pre></th>
           <td>