diff --git a/peps/pep-0007.rst b/peps/pep-0007.rst
index fc86f045067..302d4763226 100644
--- a/peps/pep-0007.rst
+++ b/peps/pep-0007.rst
@@ -50,6 +50,11 @@ C dialect
   declarations must be at the top of a block (not necessarily at the
   top of function).
 
+* The Python C API must be able to be built with the
+  ``-Werror=declaration-after-statement`` compiler flag.
+  This implies that in static inline functions in public headers,
+  variables must be declared at the top.
+
 * Don't use compiler-specific extensions, such as those of GCC or MSVC
   (e.g. don't write multi-line strings without trailing backslashes).