diff --git a/doc/src/sgml/installation.sgml b/doc/src/sgml/installation.sgml
index 2e83f7d564..95854fed25 100644
--- a/doc/src/sgml/installation.sgml
+++ b/doc/src/sgml/installation.sgml
@@ -1500,8 +1500,9 @@ su - postgres
PERL
- Full path name of the Perl interpreter. This will be used to
- determine the dependencies for building PL/Perl.
+ Perl interpreter program. This will be used to determine the
+ dependencies for building PL/Perl. The default is
+ perl.
@@ -1510,13 +1511,13 @@ su - postgres
PYTHON
- Full path name of the Python interpreter. This will be used to
+ Python interpreter program. This will be used to
determine the dependencies for building PL/Python. Also,
whether Python 2 or 3 is specified here (or otherwise
implicitly chosen) determines which variant of the PL/Python
language becomes available. See
- for more information.
+ for more information. The default is python.
@@ -1525,7 +1526,7 @@ su - postgres
TCLSH
- Full path name of the Tcl interpreter. This will be used to
+ Tcl interpreter program. This will be used to
determine the dependencies for building PL/Tcl, and it will
be substituted into Tcl scripts.