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-rw-r--r--Doc/extending/extending.rst2
1 files changed, 1 insertions, 1 deletions
diff --git a/Doc/extending/extending.rst b/Doc/extending/extending.rst
index 8cc4184..523dfab 100644
--- a/Doc/extending/extending.rst
+++ b/Doc/extending/extending.rst
@@ -27,7 +27,7 @@ your system setup; details are given in later chapters.
avoid writing C extensions and preserve portability to other implementations.
For example, if your use case is calling C library functions or system calls,
you should consider using the :mod:`ctypes` module or the `cffi
- <http://cffi.readthedocs.org>`_ library rather than writing custom C code.
+ <https://cffi.readthedocs.org>`_ library rather than writing custom C code.
These modules let you write Python code to interface with C code and are more
portable between implementations of Python than writing and compiling a C
extension module.