#19319: fix ctypes docs: sizeof is an operator in C, not a function.
diff --git a/Doc/library/ctypes.rst b/Doc/library/ctypes.rst
index a6c918d..a9dce61 100644
--- a/Doc/library/ctypes.rst
+++ b/Doc/library/ctypes.rst
@@ -1909,8 +1909,8 @@
.. function:: sizeof(obj_or_type)
- Returns the size in bytes of a ctypes type or instance memory buffer. Does the
- same as the C ``sizeof()`` function.
+ Returns the size in bytes of a ctypes type or instance memory buffer.
+ Does the same as the C ``sizeof`` operator.
.. function:: string_at(address, size=-1)