diff --git a/pep-0007.txt b/pep-0007.txt
index 894a6043d..6212c0aee 100644
--- a/pep-0007.txt
+++ b/pep-0007.txt
@@ -39,7 +39,8 @@ C dialect
 * Python versions greater than or equal to 3.6 use C89 with several
   select C99 features:
 
-  - Standard integer types in ``<stdint.h>`` and ``<inttypes.h>``
+  - Standard integer types in ``<stdint.h>`` and ``<inttypes.h>``. We
+    require the fixed width integer types.
   - ``static inline`` functions
   - designated initializers (especially nice for type declarations)
   - intermingled declarations