diff --git a/reference/json/constants.xml b/reference/json/constants.xml
index a768e6a71c..62b655de33 100644
--- a/reference/json/constants.xml
+++ b/reference/json/constants.xml
@@ -1,13 +1,12 @@
 <?xml version="1.0" encoding="utf-8"?>
-<!-- $Revision: 1.5 $ -->
+<!-- $Revision: 1.6 $ -->
 
 <appendix xml:id="json.constants" xmlns="http://docbook.org/ns/docbook" xmlns:xlink="http://www.w3.org/1999/xlink">
  &reftitle.constants;
  &extension.constants;
  <para>
-  The following constants indicates an error type returned 
-  by <function>json_last_error</function> and are all available 
-  as of PHP 5.3.0.
+  The following constants indicate the type of error returned by
+  <function>json_last_error</function>. They are all available since PHP 5.3.0.
  </para>
  <variablelist>
   <varlistentry>
@@ -17,7 +16,7 @@
    </term>
    <listitem>
     <simpara>
-     No error have occured.
+     No error has occurred.
     </simpara>
    </listitem>
   </varlistentry>
@@ -28,7 +27,7 @@
    </term>
    <listitem>
     <simpara>
-     The maximum stack depth have been exceeded.
+     The maximum stack depth has been exceeded.
     </simpara>
    </listitem>
   </varlistentry>
@@ -39,7 +38,7 @@
    </term>
    <listitem>
     <simpara>
-     Control character error, possibly wrongly encoded.
+     Control character error, possibly incorrectly encoded.
     </simpara>
    </listitem>
   </varlistentry>
@@ -56,7 +55,7 @@
   </varlistentry>
  </variablelist>
 </appendix>
- 
+
 <!-- Keep this comment at the end of the file
 Local variables:
 mode: sgml