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* www/hacking.html: Added content on how to log property changes.
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Index: www/hacking.html
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--- www/hacking.html	(revision 33188)
+++ www/hacking.html	(working copy)
@@ -1572,6 +1572,17 @@
 `handle_parser_warning', but only because the two structures were
 mentioned by full name elsewhere in the log entry.</p>
 
+<p>You should also include property changes in your log messages.
+For example, if you were to modify the "svn:ignore" property on
+the trunk, you might put something like this in your log:</p>
+
+<pre>
+   * trunk/ (svn:ignore): Ignore build.
+</pre>
+
+<p>The above only applies to properties you maintain, not those
+maintained by subversion like "svn:mergeinfo".</p>
+
 <p>Note how each file gets its own entry prefixed with an "*", and the
 changes within a file are grouped by symbol, with the symbols listed
 in parentheses followed by a colon, followed by text describing the