diff --git a/reference/classobj/functions/class-alias.xml b/reference/classobj/functions/class-alias.xml
index 0515c9fd87..8d7260a1d9 100644
--- a/reference/classobj/functions/class-alias.xml
+++ b/reference/classobj/functions/class-alias.xml
@@ -15,7 +15,7 @@
   </methodsynopsis>
   <para>
    Creates an alias named <parameter>alias</parameter>
-   based on the defined class <parameter>original</parameter>.
+   based on the user defined class <parameter>original</parameter>.
    The aliased class is exactly the same as the original class.
   </para>
  </refsect1>