diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index fbe7057a..69ec5eb2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -101,8 +101,8 @@ Happy coding!
 
 ### Using RollupJS
 
-The source javascript code for Leaflet is a few dozen files, in the `src/` directory.
-But normally, Leaflet is loaded in a web browser as just one javascript file.
+The source JavaScript code for Leaflet is a few dozen files, in the `src/` directory.
+But normally, Leaflet is loaded in a web browser as just one JavaScript file.
 
 In order to create this file, run `npm run rollup` or `yarn run rollup`.