diff --git a/public/variables b/public/variables
index 736c7c4..7bf1c69 100644
--- a/public/variables
+++ b/public/variables
@@ -154,7 +154,7 @@ initializing a variable, e.g. for
           <td class="docs">
             
           </td>
-          <td class="code">
+          <td class="code leading">
             
           <pre class="chroma"><span class="gp">$</span> go run variables.go
 <span class="go">initial
@@ -165,6 +165,21 @@ initializing a variable, e.g. for
           </td>
         </tr>
         
+        <tr>
+          <td class="docs">
+            <p>The shorthand <code>:=</code> initialization of variable can
+only be used inside any function.
+If used outside any function, it would generate
+<code>syntax error: non-declaration statement outside 
+function body</code>.</p>
+
+          </td>
+          <td class="code empty">
+            
+          
+          </td>
+        </tr>
+        
       </table>
       
       
@@ -180,7 +195,7 @@ initializing a variable, e.g. for
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