diff --git a/reference/xhprof/functions/xhprof-sample-enable.xml b/reference/xhprof/functions/xhprof-sample-enable.xml
index ec228e6c59..ebbe4b9374 100644
--- a/reference/xhprof/functions/xhprof-sample-enable.xml
+++ b/reference/xhprof/functions/xhprof-sample-enable.xml
@@ -4,7 +4,7 @@
 <refentry xml:id="function.xhprof-sample-enable" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  <refnamediv>
   <refname>xhprof_sample_enable</refname>
-  <refpurpose>Description</refpurpose>
+  <refpurpose>Start XHProf profiling in sampling mode</refpurpose>
  </refnamediv>
 
  <refsect1 role="description">