diff --git a/README.md b/README.md
index 199989c..e388595 100644
--- a/README.md
+++ b/README.md
@@ -6,7 +6,7 @@ If you like, you can operate on your entire data with classic UNIX tools.
 
 ## Installation
 
-```go
+```shell
 go get git.akyoto.dev/go/ocean
 ```