diff --git a/src/mir/index.md b/src/mir/index.md
index 20cbf75d..7027cd80 100644
--- a/src/mir/index.md
+++ b/src/mir/index.md
@@ -64,7 +64,7 @@ button on the top:
 [sample-play]: https://play.rust-lang.org/?gist=30074856e62e74e91f06abd19bd72ece&version=stable
 MIR shown by above link is optimized.
 Some statements like `StorageLive` are removed in optimization.
-This happens because compiler notices the value is never accessed in the code.
+This happens because the compiler notices the value is never accessed in the code.
 We can use `rustc [filename].rs -Z mir-opt-level=0 --emit mir` to view unoptimized MIR.
 This requires the nightly toolchain.