diff --git a/reference/imap/functions/imap-utf7-decode.xml b/reference/imap/functions/imap-utf7-decode.xml
index 113dc649bf..02697531c5 100644
--- a/reference/imap/functions/imap-utf7-decode.xml
+++ b/reference/imap/functions/imap-utf7-decode.xml
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/imap.xml, last change in rev 1.16 -->
   <refentry id="function.imap-utf7-decode">
    <refnamediv>
@@ -15,14 +15,18 @@
       <methodparam><type>string</type><parameter>text</parameter></methodparam>
      </methodsynopsis>
     <para>  
-     Decodes modified UTF-7 <parameter>text</parameter> into 8bit data.
+     Decodes modified UTF-7 <parameter>text</parameter> into ISO-8859-1 string.
     </para>
     <para>
-     Returns the decoded 8bit data, or &false; if the input string was
-     not valid modified UTF-7. This function is needed to decode
-     mailbox names that contain international characters outside of
-     the printable ASCII range. The modified UTF-7 encoding is defined
-     in <ulink url="&url.rfc;rfc2060.html">RFC 2060</ulink>, section
+     Returns a string that is encoded in ISO-8859-1 and consists of the same
+     sequence of characters in <parameter>text</parameter>, or &false;
+     if <parameter>text</parameter> contains invalid modified UTF-7 sequence
+     or <parameter>text</parameter> contains a character that is not part of
+     ISO-8859-1 character set.
+     This function is needed to decode mailbox names that contain certain
+     characters which are not in range of printable ASCII characters.
+     The modified UTF-7 encoding is defined in
+	 <ulink url="&url.rfc;rfc2060.html">RFC 2060</ulink>, section
      5.1.3 (original UTF-7 was defned in <ulink
      url="&url.rfc;rfc1642.html">RFC1642</ulink>).
     </para>
diff --git a/reference/imap/functions/imap-utf7-encode.xml b/reference/imap/functions/imap-utf7-encode.xml
index 830b3ecc81..4fa4d33c5a 100644
--- a/reference/imap/functions/imap-utf7-encode.xml
+++ b/reference/imap/functions/imap-utf7-encode.xml
@@ -1,11 +1,11 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/imap.xml, last change in rev 1.9 -->
   <refentry id="function.imap-utf7-encode">
    <refnamediv>
     <refname>imap_utf7_encode</refname>
     <refpurpose>
-     Converts 8bit data to modified UTF-7 text.
+     Converts ISO-8859-1 string to modified UTF-7 text.
     </refpurpose>
    </refnamediv>
    <refsect1>
@@ -15,10 +15,11 @@
       <methodparam><type>string</type><parameter>data</parameter></methodparam>
      </methodsynopsis>
     <para>
-     Converts 8bit <parameter>data</parameter> to modified UTF-7
-     text. This is needed to encode mailbox names that contain
-     international characters outside of the printable ASCII
-     range. The modified UTF-7 encoding is defined in <ulink
+     Converts <parameter>data</parameter> to modified UTF-7
+     text. This is needed to encode mailbox names that contain certain
+     characters which are not in range of printable ASCII characters.
+	 Note that <parameter>data</parameter> is expected to be
+	 encoded in ISO-8859-1. The modified UTF-7 encoding is defined in <ulink
      url="&url.rfc;rfc2060.html">RFC 2060</ulink>, section 5.1.3
      (original UTF-7 was defned in <ulink
      url="&url.rfc;rfc1642.html">RFC1642</ulink>).
diff --git a/reference/imap/functions/imap-utf8.xml b/reference/imap/functions/imap-utf8.xml
index 0c941a8064..a3c33ebae8 100644
--- a/reference/imap/functions/imap-utf8.xml
+++ b/reference/imap/functions/imap-utf8.xml
@@ -1,23 +1,26 @@
 <?xml version="1.0" encoding="iso-8859-1"?>
-<!-- $Revision: 1.2 $ -->
+<!-- $Revision: 1.3 $ -->
 <!-- splitted from ./en/functions/imap.xml, last change in rev 1.7 -->
   <refentry id="function.imap-utf8">
    <refnamediv>
     <refname>imap_utf8</refname>
     <refpurpose>
-      Converts text to UTF8
+     Converts MIME-encoded text to UTF-8
     </refpurpose>
    </refnamediv>
    <refsect1>
     <title>Description</title>
      <methodsynopsis>
       <type>string</type><methodname>imap_utf8</methodname>
-      <methodparam><type>string</type><parameter>text</parameter></methodparam>
+      <methodparam>
+       <type>string</type><parameter>mime_encoded_text</parameter>
+      </methodparam>
      </methodsynopsis>
     <para>
-     Converts the given <parameter>text</parameter> to 
-     UTF8 (as defined in 
-     <ulink url="&url.rfc;rfc2044.html">RFC2044</ulink>).
+     Converts the given <parameter>mime_encoded_text</parameter> to 
+     UTF-8. MIME encoding method and the UTF-8 specification are described in
+     <ulink url="&url.rfc;rfc2047.html">RFC2047</ulink> and 
+     <ulink url="&url.rfc;rfc2044.html">RFC2044</ulink> respectively.
     </para>
    </refsect1>
   </refentry>