diff --git a/.gitignore b/.gitignore
index 150e770..99fd0a6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,5 +5,9 @@
 __pycache__/
 *.pyc
 
+# Simulation artifacts
+tb/obj_dir/
+tb/*.vcd
+
 # Contest submission repo (separate GitHub repo)
 chip_ignite/