diff --git a/pep-0007.txt b/pep-0007.txt
index 4278e4c12bf..44c313b3b39 100644
--- a/pep-0007.txt
+++ b/pep-0007.txt
@@ -46,6 +46,8 @@ C dialect
   - intermingled declarations
   - booleans
   - C++-style line comments
+  - Flexible array member ``char spam[];`` syntax for the last member
+    in variable length structs (Python 3.9 or later).
 
   Future C99 features may be added to this list in the future
   depending on compiler support (mostly significantly MSVC).