diff --git a/README.md b/README.md
index 2983908..aa2c4cc 100644
--- a/README.md
+++ b/README.md
@@ -1,6 +1,6 @@
 # PM2.5-IDW-Map
 
-An PM2.5 Inverse Distance Weighting (IDW) map using [Leaflet](https://leafletjs.com/)(v0.7.7).
+An PM2.5 Inverse Distance Weighting (IDW) map using [Leaflet](https://leafletjs.com/) (v0.7.7).
 
 PM2.5 data source
 ---