diff --git a/reference/image/functions/imagecreatetruecolor.xml b/reference/image/functions/imagecreatetruecolor.xml
index d5ada8b2b8..8a12781db0 100644
--- a/reference/image/functions/imagecreatetruecolor.xml
+++ b/reference/image/functions/imagecreatetruecolor.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/image.xml, last change in rev 1.2 -->
  <refentry id="function.imagecreatetruecolor">
   <refnamediv>
@@ -19,6 +19,12 @@
     by <parameter>y_size</parameter>.
    </para>
     <note><para>This function was added in PHP 4.0.6 and requires GD 2.0.1 or later</para></note>
+    <note>
+     <para>
+      Please remember that the GIF file format only supports 256 colors, and
+      therefore will not work with this function.
+     </para>
+    </note>
    </refsect1>
   </refentry>