diff --git a/reference/strings/functions/substr.xml b/reference/strings/functions/substr.xml
index 4202a65421..2153f5d556 100644
--- a/reference/strings/functions/substr.xml
+++ b/reference/strings/functions/substr.xml
@@ -83,8 +83,8 @@ $rest = substr("abcdef", -3, 1); // returns "d"
        characters will be omitted from the end of <parameter>string</parameter>
        (after the start position has been calculated when a
        <parameter>start</parameter> is negative).  If
-       <parameter>start</parameter> denotes a position beyond this truncation,
-       an empty string will be returned.
+       <parameter>start</parameter> denotes the position of this truncation or
+       beyond, false will be returned.
       </para>
       <para>
        If <parameter>length</parameter> is given and is <literal>0</literal>,
@@ -102,7 +102,7 @@ $rest = substr("abcdef", -3, 1); // returns "d"
 <?php
 $rest = substr("abcdef", 0, -1);  // returns "abcde"
 $rest = substr("abcdef", 2, -1);  // returns "cde"
-$rest = substr("abcdef", 4, -4);  // returns ""
+$rest = substr("abcdef", 4, -4);  // returns false
 $rest = substr("abcdef", -3, -1); // returns "de"
 ?>
 ]]>
@@ -120,6 +120,32 @@ $rest = substr("abcdef", -3, -1); // returns "de"
    Returns the extracted part of string, &return.falseforfailure; or an empty string.
   </para>
  </refsect1>
+ 
+ <refsect1 role="changelog">
+  &reftitle.changelog;
+  <para>
+   <informaltable>
+    <tgroup cols="2">
+     <thead>
+      <row>
+       <entry>&Version;</entry>
+       <entry>&Description;</entry>
+      </row>
+     </thead>
+     <tbody>
+      <row>
+       <entry>5.2.2</entry>
+       <entry>
+        If the <parameter>start</parameter> parameter indicates the position of
+        a negative truncation or beyond, false is returned. Prior to this
+        version, an empty string was returned.
+       </entry>
+      </row>
+     </tbody>
+    </tgroup>
+   </informaltable>
+  </para>
+ </refsect1>
 
  <refsect1 role="examples">
   &reftitle.examples;