diff --git a/reference/exec/reference.xml b/reference/exec/reference.xml
index d47be34753..1a18087ba8 100644
--- a/reference/exec/reference.xml
+++ b/reference/exec/reference.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
  <reference id="ref.exec">
   <title>Program Execution functions</title>
   <titleabbrev>Program Execution</titleabbrev>
@@ -41,8 +41,11 @@
    <section id="exec.seealso">
    &reftitle.seealso;
     <para>
-     Those functions are also closely related to the 
+     These functions are also closely related to the 
      <link linkend="language.operators.execution">backtick operator</link>.
+     Also, while in <link linkend="features.safe-mode">Safe Mode</link> you
+     must consider the <link linkend="ini.safe-mode-exec-dir">
+     safe_mode_exec_dir</link> directive.
     </para>
    </section>