Index: data/glade/gthumb_tools.glade
===================================================================
RCS file: /cvs/gnome/gthumb/data/glade/gthumb_tools.glade,v
retrieving revision 1.19
diff -u -r1.19 gthumb_tools.glade
--- data/glade/gthumb_tools.glade	8 Oct 2006 08:45:23 -0000	1.19
+++ data/glade/gthumb_tools.glade	8 Oct 2006 13:57:50 -0000
@@ -864,7 +864,7 @@
 	  <child>
 	    <widget class="GtkLabel" id="label92">
 	      <property name="visible">True</property>
-	      <property name="label" translatable="yes">&lt;small&gt;&lt;i&gt;&lt;b&gt;Note&lt;/b&gt;: jpeg transformations are lossless.&lt;/i&gt;&lt;/small&gt;</property>
+	      <property name="label" translatable="yes">&lt;small&gt;&lt;i&gt;&lt;b&gt;Note&lt;/b&gt;: JPEG transformations are normally lossless.&lt;/i&gt;&lt;/small&gt;</property>
 	      <property name="use_underline">False</property>
 	      <property name="use_markup">True</property>
 	      <property name="justify">GTK_JUSTIFY_LEFT</property>
Index: doc/C/gthumb.xml
===================================================================
RCS file: /cvs/gnome/gthumb/doc/C/gthumb.xml,v
retrieving revision 1.24
diff -u -r1.24 gthumb.xml
--- doc/C/gthumb.xml	8 Oct 2006 08:45:33 -0000	1.24
+++ doc/C/gthumb.xml	8 Oct 2006 13:57:51 -0000
@@ -2,9 +2,9 @@
 <!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" 
 "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"[
   <!ENTITY legal SYSTEM "legal.xml">
-  <!ENTITY appversion "2.6">
-  <!ENTITY manualversion "2.6">
-  <!ENTITY date "September 2004">
+  <!ENTITY appversion "2.9.0">
+  <!ENTITY manualversion "2.9.0">
+  <!ENTITY date "October 2006">
   <!ENTITY appname "gThumb">
   <!ENTITY app "<application>gThumb</application>">
 <!-- replace version above with actual application version number -->
@@ -1974,7 +1974,7 @@
       <title>To Rotate Images Without Loss of Quality</title>
       <para>
         Usually if you want to rotate an image you have to open the image with
-        an editor, rotate the image and save it.  This works good for
+        an editor, rotate the image, and then save it.  This works well for
         image formats such as PNG or GIF, but results in a loss of
         quality for JPEG images.
       </para>
@@ -1999,18 +1999,40 @@
       <note>
         <title>NOTE</title>
         <para>
-          If you check both the <guilabel>Adjust photo orientation</guilabel>
-	  and the <guilabel>Apply to all images</guilabel> options, all the
-	  images will be rotated by the value in each photo orientation data.
+          If the selection contains some non-JPEG images, they are
+          rotated as well.
         </para>
       </note>
+      </para>
+      <para>
+        In general, there are two ways to rotate a JPEG image. The first way
+        is to re-arrange the pixels inside the image file. The second way is
+        to change the value of the Exif orientation tag inside the JPEG file.
+        Not all JPEG files have Exif tags however, and not all applications
+        support them. If your image does not have Exif tags, the pixels will
+        be re-arranged inside the image file automatically. If your image
+        does have Exif tags, then the pixels will only be re-arranged inside the
+        file if you check the <guilabel>Adjust photo orientation</guilabel>
+        checkbox. In this mode, the Exif orientation tag will be reset to its default value 
+        of "top left". If your image has Exif tags and you do not select this option,
+        then only the tag will be changed, and the raw image data itself will not
+        be re-arranged.
       <note>
         <title>NOTE</title>
         <para>
-          If the selection contains some non-JPEG images, they are
-          rotated as well.
+        For maximum compatibility with other applications, it is recommended that
+        the <guilabel>Adjust photo orientation</guilabel> checkbox normally be enabled.
         </para>
       </note>
+      </para>
+      <para>The re-arrangement of pixel data inside the JPEG file will not
+        degrade image quality (that is, it is lossless) under most conditions.
+        However, if the image dimensions (height and width) are not both multiples
+        of 8, some data corruption will occur along one of the edges of the 
+        image. If there is no Exif orientation tag in the JPEG file, this
+        data corruption will occur. If there is an Exif orientation tag, &app; 
+        will avoid data corruption by changing the Exif orientation tag, even if 
+        the <guilabel>Adjust photo orientation</guilabel> checkbox is enabled.
       </para>
     </sect2>
     <sect2 id="gthumb-convert-format">
