diff --git a/src/lib.rs b/src/lib.rs
index c115a6e..ed4f2be 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,4 +1,6 @@
-#![doc(html_logo_url = "https://raw.githubusercontent.com/baoyachi/duration-rs/master/duration-str.png")]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/baoyachi/duration-rs/master/duration-str.png"
+)]
 //! Parse string to `Duration` .
 //!
 //! The String value unit support for one of:["y","mon","w","d","h","m","s", "ms", "µs", "ns"]