diff --git a/functions/calendar.xml b/functions/calendar.xml
index 08e49c6aa2..689565f202 100644
--- a/functions/calendar.xml
+++ b/functions/calendar.xml
@@ -4,9 +4,10 @@
 
   <partintro>
    <para>
-    The calendar functions are only available if you have compiled the
-    calendar extension in dl/calendar. Read dl/README for instructions
-    on using it.
+    The calendar functions are only available if you have compiled
+    the calendar extension, found in either the "dl" or "ext"
+    subdirectories of your PHP source code.
+    Please see the README file before using it.
    </para>
    <para>
     The calendar extension presents a series of functions to simplify