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-rw-r--r--doc/src/sgml/installation.sgml10
1 files changed, 7 insertions, 3 deletions
diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index c5e53dace4a..5621606f59a 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -3080,9 +3080,13 @@ ninja install
<term><option>-DPG_TEST_EXTRA=<replaceable>TEST_SUITES</replaceable></option></term>
<listitem>
<para>
- Enable test suites which require special software to run. This option
- accepts arguments via a whitespace-separated list. See <xref
- linkend="regress-additional"/> for details.
+ Enable additional test suites, which are not run by default because
+ they are not secure to run on a multiuser system, require special
+ software to run, or are resource intensive. The argument is a
+ whitespace-separated list of tests to enable. See
+ <xref linkend="regress-additional"/> for details. If the
+ <envar>PG_TEST_EXTRA</envar> environment variable is set when the
+ tests are run, it overrides this setup-time option.
</para>
</listitem>
</varlistentry>