diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index 2b955870b9..edb476aa2f 100644
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -125,7 +125,9 @@ gmake installcheck-parallel
The tests will expect to contact the server at the local host and the
default port number, unless directed otherwise by PGHOST and
- PGPORT environment variables.
+ PGPORT environment variables. The tests will be run in a
+ database named regression>; any existing database by this name
+ will be dropped.
@@ -147,7 +149,9 @@ gmake installcheck
The contrib> modules must have been built and installed first.
You can also do this in a subdirectory of contrib> to run
- the tests for just one module.
+ the tests for just one module. Tests of contrib> modules will
+ be run in a database named contrib_regression>; any existing
+ database by this name will be dropped.
@@ -471,6 +475,18 @@ diff results/random.out expected/random.out
not worry unless the random test fails repeatedly.
+
+
+ Configuration Parameters
+
+
+ When running the tests against an existing installation, some non-default
+ parameter settings could cause the tests to fail. For example, the
+ settings described in
+ could cause plan changes that would affect the results of tests which
+ use EXPLAIN>.
+
+