diff --git a/lib/ps2_port/ghdl/.gitignore.templ b/lib/ps2_port/ghdl/.gitignore.templ
new file mode 100644
index 0000000..907336a
--- /dev/null
+++ b/lib/ps2_port/ghdl/.gitignore.templ
@@ -0,0 +1,4 @@
+.gitignore
+build/
+.gitignore
+build/
diff --git a/lib/ps2_port/ghdl/tb_ps2_core.make b/lib/ps2_port/ghdl/tb_ps2_core.make
index 6a986e6..e057b85 100644
--- a/lib/ps2_port/ghdl/tb_ps2_core.make
+++ b/lib/ps2_port/ghdl/tb_ps2_core.make
@@ -9,6 +9,7 @@ SRCS += $(MOD_PATH)/src/tb_ps2_core.vhd
 TARGET := tb_ps2_core
 ENTITY := tb_ps2_core
 RUN_TIME := 10ms
+WAVE_FORMAT := vcd
 
 include $(VHDL_HOME)/make/ghdl.mk