diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..d9568ca
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+*swp
diff --git a/TODO b/TODO
index 6890965..055bf31 100644
--- a/TODO
+++ b/TODO
@@ -2,6 +2,7 @@ CPU:
 - LDY and LDX must behave properly in 8-bit mode when x bit in the p status 
   register is set to one
 - Accumulator must behave properly when in 8-bit mode
+- Emulation mode support in general.
 - Have each operation return the number of cycles used by the execute function.
 - updating the n bit of the status register
 - Implement another 200+ operations