svn log says text-mods="true" but there are no diffs

I get the following:

$ svn log --xml -v -r 1984 https://scm.gforge.inria.fr/anonscm/svn/mpfr
<logentry
   revision="1984">
<author>vlefevre</author>
<date>2002-07-23T16:22:08.000000Z</date>
<paths>
<path
   prop-mods="false"
   text-mods="true"
   kind="file"
   action="M">/trunk/mul.c</path>
</paths>
<msg>Fixed permissions.
</msg>
</logentry>
</log>

I'm wondering why text-mods="true" while

  svn diff -c 1984 https://scm.gforge.inria.fr/anonscm/svn/mpfr

shows no diffs.

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Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)