diff --git a/jemallocator/README.md b/jemallocator/README.md
index fd0e6539b..207a51d55 100644
--- a/jemallocator/README.md
+++ b/jemallocator/README.md
@@ -73,7 +73,7 @@ This crate provides following cargo feature flags:
 
 * `alloc_trait` When the `alloc_trait` feature of this crate is enabled, it also implements the `Alloc` trait, allowing usage in collections.
 
-* `default` feature is `background_threads_runtime_support`
+* `default` feature is `background_threads_runtime_support`.
 
 * The `tikv-jemallocator` crate re-exports the [features of the `tikv-jemalloc-sys`
 dependency](https://github.com/tikv/jemallocator/blob/master/jemalloc-sys/README.md#features).