diff --git a/.gitignore b/.gitignore
index 34a0c0bc2..50b3b97f8 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,3 +16,5 @@ packages/
 OALLexer.tokens
 .factorypath  
 .vscode 
+.checkstyle
+.externalToolBuilders