diff --git a/reference/mbstring/functions/mb-convert-case.xml b/reference/mbstring/functions/mb-convert-case.xml
index bbe74bb8d6..f82a36a739 100644
--- a/reference/mbstring/functions/mb-convert-case.xml
+++ b/reference/mbstring/functions/mb-convert-case.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
   <refentry id="function.mb-convert-case">
    <refnamediv>
     <refname>mb_convert_case</refname>
@@ -25,7 +25,7 @@
     <para>
      <parameter>encoding</parameter> specifies the encoding of
      <parameter>str</parameter>; if omitted, the internal character encoding
-     value (mbstring.internal_encoding) will be used.
+     value will be used.
     </para>
     <para>
      The return value is str with the appropriate case folding applied.
@@ -34,7 +34,7 @@
      By contrast to the standard case folding functions such as
      <function>strtolower</function> and <function>strtoupper</function>,
      case folding is performed on the basis of the Unicode character
-     properties. So the behaviour of this function is not affected
+     properties. Thus the behaviour of this function is not affected
      by locale settings and it can convert any characters that have
      'alphabetic' property, such as A-umlaut (&Auml;). 
     </para>
diff --git a/reference/mbstring/functions/mb-strtolower.xml b/reference/mbstring/functions/mb-strtolower.xml
index ae849fb063..5c192bb4a0 100644
--- a/reference/mbstring/functions/mb-strtolower.xml
+++ b/reference/mbstring/functions/mb-strtolower.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
   <refentry id="function.mb-strtolower">
    <refnamediv>
     <refname>mb_strtolower</refname>
@@ -19,7 +19,7 @@
     <para>
      <parameter>encoding</parameter> specifies the encoding of
      <parameter>str</parameter>; if omitted, the internal character encoding
-     value (mbstring.internal_encoding) will be used.
+     value will be used.
     </para>
     <para>
      For more information about the Unicode properties, please see <ulink
@@ -27,7 +27,7 @@
     </para>
     <para>
      By contrast to <function>strtolower</function>, 'alphabetic' is
-     determined by the Unicode character properties. So the behaviour
+     determined by the Unicode character properties. Thus the behaviour
      of this function is not affected by locale settings and it can convert
      any characters that have 'alphabetic' property, such as A-umlaut (&Auml;). 
     </para>
diff --git a/reference/mbstring/functions/mb-strtoupper.xml b/reference/mbstring/functions/mb-strtoupper.xml
index 5d4fdb5616..5e9d6e488c 100644
--- a/reference/mbstring/functions/mb-strtoupper.xml
+++ b/reference/mbstring/functions/mb-strtoupper.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.1 $ -->
+<!-- $Revision: 1.2 $ -->
   <refentry id="function.mb-strtoupper">
    <refnamediv>
     <refname>mb_strtoupper</refname>
@@ -19,11 +19,11 @@
     <para>
      <parameter>encoding</parameter> specifies the encoding of
      <parameter>str</parameter>; if omitted, the internal character encoding
-     value (mbstring.internal_encoding) will be used.
+     value will be used.
     </para>
     <para>
      By contrast to <function>strtoupper</function>, 'alphabetic' is
-     determined by the Unicode character properties. So the behaviour of this
+     determined by the Unicode character properties. Thus the behaviour of this
      function is not affected by locale settings and it can convert any
      characters that have 'alphabetic' property, such as a-umlaut (&auml;). 
     </para>