diff --git a/src/rust-2021/reserving-syntax.md b/src/rust-2021/reserving-syntax.md
index b69fd3b5..52f8e122 100644
--- a/src/rust-2021/reserving-syntax.md
+++ b/src/rust-2021/reserving-syntax.md
@@ -3,7 +3,8 @@
 ## Summary
 
 - `any_prefix#..`, `any_prefix".."`, and `any_prefix'..'` are reserved syntax, and no longer tokenize.
-- These did not parse as valid Rust in any edition, except in arguments to macros.
+- This is mostly relevant to macros. E.g. `quote!{ #a#b }` is no longer accepted.
+- It doesn't treat keywords specially, so e.g. `match".." {}` is no longer accepted.
 - Insert whitespace to avoid errors.
 
 ## Details