diff --git a/pep-0651.rst b/pep-0651.rst
index 97c348090..17265c898 100644
--- a/pep-0651.rst
+++ b/pep-0651.rst
@@ -132,8 +132,8 @@ Py_CheckStackDepthWithHeadRoom()
 
 ``int Py_CheckStackDepthWithHeadroom(const char *where, int headroom)``
 Behaves like ``Py_CheckStackDepth(where)`` but reduces the effective stack size
-by ``headroom`` when determining the risk of C stack overflow.
-This function should be used when additional C stack will
+by ``headroom`` bytes when determining the risk of C stack overflow.
+This function should be used when additional C stack will be
 needed for cleanup.
 
 ``Py_CheckStackDepth(where)`` is equivalent to ``Py_CheckStackDepthWithHeadRoom(where, 0)``.