diff --git a/appendices/debugger.xml b/appendices/debugger.xml
index 9b2cff11bd..d6b2301226 100644
--- a/appendices/debugger.xml
+++ b/appendices/debugger.xml
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.17 $ -->
+<!-- $Revision: 1.18 $ -->
  <appendix id="debugger">
-  <title>Debugging PHP 3</title>
+  <title>Debugging PHP</title>
 
   <sect1 id="debugger-about">
    <title>About the debugger</title>
@@ -9,7 +9,11 @@
     PHP 3 includes support for a network-based debugger.
    </simpara>
    <simpara>
-    PHP 4 does not yet have a similar debugging facility.
+    PHP 4 does not have an internal debugging facility.
+    You can use one of the external debuggers though. The
+    <ulink url="&url.zend.ide;">Zend IDE</ulink> includes
+    a debugger, and there is also a free debugger extension
+    named DBG at <ulink url="&url.dbg;">&url.dbg;</ulink>.
    </simpara>
   </sect1>