diff --git a/reference/image/functions/imagecreatetruecolor.xml b/reference/image/functions/imagecreatetruecolor.xml
index 7e676c0a92..22d774bf6d 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: 1.8 $ -->
+<!-- $Revision: 1.9 $ -->
 <!-- splitted from ./en/functions/image.xml, last change in rev 1.2 -->
  <refentry id="function.imagecreatetruecolor">
   <refnamediv>
@@ -18,6 +18,14 @@
     representing a black image of size <parameter>x_size</parameter>
     by <parameter>y_size</parameter>.
    </para>
+   <para>
+    Depending on your PHP and GD versions this function is defined or not. With
+    PHP 4.0.6 through 4.1.x this function always exists if the GD module is
+    loaded, but calling it without GD2 being installed PHP will issue a fatal
+    error and exit. With PHP 4.2.x this behaviour is differnet in issueing a
+    warning instead of an error. Other versions only define this function, if
+    the correct GD version is installed.
+   </para>
    <para>
     <example>
      <title>