diff --git a/README.input_filter b/README.input_filter
index f55a1eb69da..8fb8244bd82 100644
--- a/README.input_filter
+++ b/README.input_filter
@@ -10,7 +10,10 @@ The Input Filter support in PHP 5 is aimed at providing the framework
 through which a company-wide or site-wide security policy can be
 enforced.  It is implemented as a SAPI hook and is called from the
 treat_data and post handler functions.  To implement your own security
-policy you will need to write a standard PHP extension.  
+policy you will need to write a standard PHP extension.  There is also
+a powerful standard implementation in ext/filter that should suit most
+peoples' needs.  However, if you want to implement your own security 
+policy, read on.
 
 A simple implementation might look like the following.  This stores the
 original raw user data and adds a my_get_raw() function while the normal