diff --git a/README.md b/README.md
index 4e96f60..2351282 100644
--- a/README.md
+++ b/README.md
@@ -225,7 +225,7 @@ function sum(a: number, b: number): ?number {
   return a + b;
 }
 
-// This one should fails during the transpilation/compilation.
+// This one should fail during the transpilation/compilation.
 const guessWhat = sum([], {}); // -> undefined
 ```