diff --git a/reference/image/functions/imagealphablending.xml b/reference/image/functions/imagealphablending.xml
index 59ca772ef6..06cc075fc8 100644
--- a/reference/image/functions/imagealphablending.xml
+++ b/reference/image/functions/imagealphablending.xml
@@ -34,7 +34,8 @@
      <term><parameter>blendmode</parameter></term>
      <listitem>
       <para>
-       Whether to enable the blending mode or not. Default to &false;.
+       Whether to enable the blending mode or not. On true color images 
+       the default value is &true; otherwise the default value is &false;
       </para>
      </listitem>
     </varlistentry>