checking things off

1 files changed, 4 insertions, 2 deletions

diff --git a/TODO.md b/TODO.md
index 2c4239a..caefc4a 100644
--- a/TODO.md
+++ b/TODO.md
@@ -9,12 +9,14 @@
 - [ ] exponent
 
 ### Strings
-- [ ] concat
+- [X] concat
 - [ ] substring
 - [ ] lower/uppercase
 
 ### Control
-- [ ] if
+- [X] if
+- [ ] if with empty else
+- [ ] branch
 
 ## Lists
 - [ ] lex