diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 4e586a1..8a23e65 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -3946,7 +3946,7 @@
 #ifdef HAVE_SETPGRP
 PyDoc_STRVAR(posix_setpgrp__doc__,
 "setpgrp()\n\n\
-Make this process a session leader.");
+Make this process the process group leader.");
 
 static PyObject *
 posix_setpgrp(PyObject *self, PyObject *noargs)