diff --git a/android/api_levels.go b/android/api_levels.go
index c77ced1..70b251b 100644
--- a/android/api_levels.go
+++ b/android/api_levels.go
@@ -16,6 +16,7 @@
 
 import (
 	"encoding/json"
+	"path/filepath"
 
 	"github.com/google/blueprint"
 )
@@ -39,8 +40,9 @@
 	}
 
 	ctx.Build(pctx, blueprint.BuildParams{
-		Rule:    WriteFile,
-		Outputs: []string{file},
+		Rule:        WriteFile,
+		Description: "generate " + filepath.Base(file),
+		Outputs:     []string{file},
 		Args: map[string]string{
 			"content": string(jsonStr[:]),
 		},