diff --git a/exercises/practice/anagram/.docs/instructions.append.md b/exercises/practice/anagram/.docs/instructions.append.md
index 739b6f2f2..85e50cb5f 100644
--- a/exercises/practice/anagram/.docs/instructions.append.md
+++ b/exercises/practice/anagram/.docs/instructions.append.md
@@ -1,4 +1,6 @@
 # Instructions append
 
+The Rust track extends the possible letters to be any unicode character, not just ASCII alphabetic ones.
+
 You are going to have to adjust the function signature provided in the stub in order for the lifetimes to work out properly.
 This is intentional: what's there demonstrates the basics of lifetime syntax, and what's missing teaches how to interpret lifetime-related compiler errors.