diff --git a/modules/openapi-generator/src/main/resources/go/README.mustache b/modules/openapi-generator/src/main/resources/go/README.mustache
index b00e98e55cb3..f13136a8f35d 100644
--- a/modules/openapi-generator/src/main/resources/go/README.mustache
+++ b/modules/openapi-generator/src/main/resources/go/README.mustache
@@ -69,7 +69,7 @@ Each operation can use different server URL defined using `OperationServers` map
 An operation is uniquely identified by `"{classname}Service.{nickname}"` string.
 Similar rules for overriding default operation server index and variables applies by using `sw.ContextOperationServerIndices` and `sw.ContextOperationServerVariables` context maps.
 
-```
+```golang
 ctx := context.WithValue(context.Background(), {{packageName}}.ContextOperationServerIndices, map[string]int{
 	"{classname}Service.{nickname}": 2,
 })