diff --git a/zangramru/utils/trie.py b/zangramru/utils/trie.py
index 9ee3c66..e5c0c03 100644
--- a/zangramru/utils/trie.py
+++ b/zangramru/utils/trie.py
@@ -17,7 +17,7 @@ class TrieNode:
 
     def add(self, word: str, definitions: list[str] | None = None) -> None:
         """Add a word to the trie."""
-        word = word.lower().strip().replace("ё", "е")
+        word = word.lower().strip().replace("ё", "е")  # noqa: RUF001
         node = self
         for i in range(len(word)):
             if word[i] not in node.children:
@@ -35,7 +35,7 @@ class TrieNode:
         the word is in the trie, or
         is a prefix of a longer word.
         """
-        word = word.lower().strip().replace("ё", "е")
+        word = word.lower().strip().replace("ё", "е")  # noqa: RUF001
         node = self
         for i in range(len(word)):
             if word[i] not in node.children: