diff --git a/Misc/python.man b/Misc/python.man
index 89a15a5..74b2d72 100644
--- a/Misc/python.man
+++ b/Misc/python.man
@@ -413,6 +413,8 @@
 The search path can be manipulated from within a Python program as the
 variable
 .IR sys.path .
+.IP PYTHONPLATLIBDIR
+Override sys.platlibdir.
 .IP PYTHONSTARTUP
 If this is the name of a readable file, the Python commands in that
 file are executed before the first prompt is displayed in interactive