Update exploration/beauty-contest.md

Co-authored-by: Eemeli Aro <[email protected]>
unicode-org · Oct 10, 2023 · c4d91c7 · c4d91c7
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diff --git a/exploration/beauty-contest.md b/exploration/beauty-contest.md
@@ -145,6 +145,8 @@ See [#487](https://github.com/unicode-org/message-format-wg/pull/487) for a disc
 The sigil `#` was chosen because `#define` type constructs are fairly common.
 Introduces `[`/`]` for keys.
 
+Requires escaping `#` when used as a pattern character.
+
 ```
 #input {$var :function option=value}
 Hello {$var}