diff --git a/jemallocator/README.md b/jemallocator/README.md
index e9e13e6..a7702bb 100644
--- a/jemallocator/README.md
+++ b/jemallocator/README.md
@@ -36,7 +36,7 @@ tikv-jemallocator = "0.5"
 To set `tikv_jemallocator::Jemalloc` as the global allocator add this to your project:
 
 ```rust
-# main.rs
+// main.rs
 #[cfg(not(target_env = "msvc"))]
 use tikv_jemallocator::Jemalloc;