diff --git a/Modules/posixmodule.c b/Modules/posixmodule.c
index 590a47b..65a0a5e 100644
--- a/Modules/posixmodule.c
+++ b/Modules/posixmodule.c
@@ -4059,7 +4059,7 @@
 #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)