diff --git a/README.md b/README.md
index be65a9c..3d2efdb 100644
--- a/README.md
+++ b/README.md
@@ -50,7 +50,7 @@ incorrect.
 [2] !guess aRa, bRc, dRa, dRc
 incorrect.
 [1] !guess aRa, bRc, dRa, aRd
-correct! congratuations!!
+correct! congratulations!!
 id: 389
 a ==> a
 a ==> c
diff --git a/index.ts b/index.ts
index 247f322..2677ed7 100644
--- a/index.ts
+++ b/index.ts
@@ -73,7 +73,7 @@ rl.on("line", (line) => {
     const expr = input.replace("!guess", "").trim();
     try {
       if (guess(expr)) {
-        console.log("correct! congratuations!!");
+        console.log("correct! congratulations!!");
         show();
         reset();
       } else {