diff --git a/README.md b/README.md
index 9eba237..e3ffea8 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,8 @@ cargo run -- --f <filename.asc>
 ```
 
 ## Todo
-- [x] Assembler
+- [ ] Assembler
     - [x] Lexer/Tokenizer
+    - [ ] Add label support (supporting JMP/JZ/JNZ)
 - [ ] Error handling
 - [ ] Build Debugger
diff --git a/program.asm b/program.asm
index 09ecba8..74bebdd 100644
--- a/program.asm
+++ b/program.asm
@@ -1,4 +1,10 @@
+; add
 mov a, 10
 mov b, 5
 add a, b
+
+; sub
+mov a, 15
+mov b, 15
+sub a, b
 hlt