doc: Mention --enable-tap-tests in regression test chapter

Reported-by: Jeff Janes 

diff --git a/doc/src/sgml/regress.sgml b/doc/src/sgml/regress.sgml
index b9d1af87071e12242bdabd307def54e4784f8342..8229528bd460251aefa81f29dc531fc8e47bdc64 100644 (file)
--- a/doc/src/sgml/regress.sgml
+++ b/doc/src/sgml/regress.sgml
@@ -205,6 +205,12 @@ make installcheck-world
    ecpg1_regression, or ecpg2_regression, as well as
    regression.
   
+
+  
+   The TAP tests are only run when PostgreSQL was configured with the
+   option --enable-tap-tests.  This is recommended for
+   development, but can be omitted if there is no suitable Perl installation.
+