diff --git a/appendices/ini.xml b/appendices/ini.xml
index 9314e89459..949826a04c 100644
--- a/appendices/ini.xml
+++ b/appendices/ini.xml
@@ -4018,9 +4018,9 @@ auto_prepend_file=security.php
         Prior to PHP 5.2.1, in order to use this directive it had to
         be enabled at compile time by using
         <option role="configure">--enable-memory-limit</option> in the
-        configure line. This was also required to define the functions
-        <function>memory_get_usage</function> and
-        <function>memory_get_peak_usage</function>.
+        configure line. This compile-time flag was also required to define
+        the functions <function>memory_get_usage</function> and
+        <function>memory_get_peak_usage</function> prior to 5.2.1.
        </para>
 
        &ini.shorthandbytes;