diff --git a/Misc/python.man b/Misc/python.man
index fa88a2586dcabf..44546ba6851050 100644
--- a/Misc/python.man
+++ b/Misc/python.man
@@ -623,6 +623,8 @@ specifying \fB\-O\fP multiple times.
 Augments the default search path for module files.
 The format is the same as the shell's $PATH: one or more directory
 pathnames separated by colons.
+Unlike POSIX $PATH, an unset or empty value will not add the current
+working directory to the search path.
 Non-existent directories are silently ignored.
 The default search path is installation dependent, but generally
 begins with ${prefix}/lib/python<version> (see PYTHONHOME above).