diff --git a/reference/pcre/pattern.syntax.xml b/reference/pcre/pattern.syntax.xml
index 48a8e8caf5..809af51049 100644
--- a/reference/pcre/pattern.syntax.xml
+++ b/reference/pcre/pattern.syntax.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.13 $ -->
+<!-- $Revision: 1.14 $ -->
 <!-- splitted from ./en/functions/pcre.xml, last change in rev 1.2 -->
   <refentry id="reference.pcre.pattern.syntax">
    <refnamediv>
@@ -1749,6 +1749,14 @@
       which they refer.
      </para>
      
+     <para>
+      The maximum length of a subject string is the largest positive number
+      that an integer variable can hold. However, PCRE uses recursion to
+      handle subpatterns and indefinite repetition. This means that the
+      available stack space may limit the size of a subject string that can be
+      processed by certain patterns.
+     </para>
+     
     </refsect2>
 
     <refsect2 id="regexp.reference.performances">