--- a/src/doc/user/usermanual.xml
+++ b/src/doc/user/usermanual.xml
@@ -5394,6 +5394,32 @@
</listitem>
</varlistentry>
+ <varlistentry><term><varname>testmodifusemtime</varname></term>
+ <listitem><para>If true, use mtime instead of default ctime to
+ determine if a file has been modified (in addition to
+ size, which is always used). Setting this can reduce
+ re-indexing on systems where extended attributes are
+ modified (by some other application), but not indexed
+ (changing extended attributes only affects
+ ctime). Notes:
+ <itemizedlist>
+ <listitem><para>This may prevent detection of change
+ in some marginal file rename cases (the target would
+ need to have the same size and
+ mtime).</para></listitem>
+ <listitem><para>You should probably also set
+ noxattrfields to 1 in this case, except if you still
+ prefer to perform xattr indexing, for example if the
+ local file update pattern makes it of value (as in
+ general, there is a risk for pure extended attributes
+ updates without file modification to go
+ undetected).</para></listitem>
+ </itemizedlist>
+ Perform a full index reset after changing the value of
+ this parameter.
+ </para></listitem>
+ </varlistentry>
+
<varlistentry><term><varname>noxattrfields</varname></term>
<listitem><para>Recoll versions 1.19 and later
automatically translate file extended attributes into