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-rw-r--r--Doc/c-api/reflection.rst2
1 files changed, 2 insertions, 0 deletions
diff --git a/Doc/c-api/reflection.rst b/Doc/c-api/reflection.rst
index 4d3d25e..498219f 100644
--- a/Doc/c-api/reflection.rst
+++ b/Doc/c-api/reflection.rst
@@ -35,6 +35,8 @@ Reflection
Return the line number that *frame* is currently executing.
+ *frame* must not be ``NULL``.
+
.. c:function:: const char* PyEval_GetFuncName(PyObject *func)