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diff --git a/doc/File_Formats.html b/doc/File_Formats.html
index d6e38c5..aa0f4f4 100644
--- a/doc/File_Formats.html
+++ b/doc/File_Formats.html
@@ -3,7 +3,7 @@
<head>
<title>Argyll File Formats</title>
<meta http-equiv="content-type" content="text/html;
- charset=ISO-8859-1">
+ charset=windows-1252">
<meta name="author" content="Graeme Gill">
</head>
<body>
@@ -19,6 +19,7 @@
<a href="#.cht">.cht</a> <br>
<a href="#.gam">.gam</a> <br>
<a href="#.sp">.sp</a><br>
+ <a href="File_Formats.html#.cmf">.cmf</a><br>
<a href="#CGATS">CGATS</a><br>
<a href="#ICC">ICC</a><br>
<a href="#MPP">MPP</a><br>
@@ -89,11 +90,17 @@
<h2><a name=".sp"></a>.sp</h2>
Spectral illuminant description. This is an ASCII text, <a
href="File_Formats.html#CGATS">CGATS</a>, Argyll specific format,
- used to hold a spectral description of an illuminant. Typically it
- is used to record a custom illuminant, for use in
- computing&nbsp;Fluorescent Whitening Agent compensation for
+ used to hold one or more spectral descriptions of an illuminant or
+ color. Typically it is used to record a custom illuminant, for use
+ in computing&nbsp;Fluorescent Whitening Agent compensation for
reflective samples, as well as computing CIE tristimulus values from
spectral samples.<br>
+ <h2><a name=".cmf"></a>.cmf</h2>
+ Color Matching Functions. This is an ASCII text, <a
+ href="file:///D:/src/argyll/doc/File_Formats.html#CGATS">CGATS</a>,
+ Argyll specific format, used to hold three spectral response curves
+ that define a tristimulus observer. The format is the same as a .sp
+ file.<i></i>
<h2><a name=".ccmx"></a>.ccmx</h2>
Colorimeter Correction Matrix. This is an ASCII text, <a
href="File_Formats.html#CGATS">CGATS</a>, Argyll specific format,
@@ -112,7 +119,8 @@
tuned for a particular display. The file contains a description of
the display, the display technology type, the type of spectrometer
used for taking the readings. See <a href="oeminst.html">oeminst</a>
- and <a href="ccxxmake.html">ccxxmake</a> for more information.<br>
+ and <a href="ccxxmake.html">ccxxmake</a> for more information. The
+ format is similar to a .sp file.<br>
<h3><a name="CGATS"></a>CGATS</h3>
CGATS.5 Data Exchange Format, from the Annex J, of the ANSI
CGATS.5-1993 standard.<br>