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-rw-r--r--doc/src/sgml/regress.sgml5
1 files changed, 4 insertions, 1 deletions
diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index 60250bb7a9f..327c3d04f7b 100644
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -285,7 +285,10 @@ gmake check EXTRA_TESTS=collate.linux.utf8 LANG=en_US.utf8
file against the reference outputs stored in the
<filename>src/test/regress/expected</filename> directory. Any
differences are saved for your inspection in
- <filename>src/test/regress/regression.diffs</filename>. (Or you
+ <filename>src/test/regress/regression.diffs</filename>. If you don't
+ like the <command>diff</command> options that are used by default, set the
+ environment variable <envar>PG_REGRESS_DIFF_OPTS</envar>, for
+ instance <literal>PG_REGRESS_DIFF_OPTS='-u'</literal>. (Or you
can run <command>diff</command> yourself, if you prefer.)
</para>