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-rw-r--r--Doc/c-api/capsule.rst3
1 files changed, 2 insertions, 1 deletions
diff --git a/Doc/c-api/capsule.rst b/Doc/c-api/capsule.rst
index 5eb313c..908e926 100644
--- a/Doc/c-api/capsule.rst
+++ b/Doc/c-api/capsule.rst
@@ -34,7 +34,8 @@ Refer to :ref:`using-capsules` for more information on using these objects.
.. c:function:: int PyCapsule_CheckExact(PyObject *p)
- Return true if its argument is a :c:type:`PyCapsule`.
+ Return true if its argument is a :c:type:`PyCapsule`. This function always
+ succeeds.
.. c:function:: PyObject* PyCapsule_New(void *pointer, const char *name, PyCapsule_Destructor destructor)