diff --git a/FEATURES.md b/FEATURES.md
index 6172d30..0b3ec0a 100644
--- a/FEATURES.md
+++ b/FEATURES.md
@@ -295,7 +295,7 @@ Buffers are in-memory representations of files. A buffer exists for each open fi
 
 ### Buffer State
 - [ ] Track cursor position per buffer
-- [ ] Track undo history per buffer
+- [x] Track undo history per buffer
 - [ ] Track marks per buffer
 - [ ] Remember scroll position when switching
 - [ ] Alternate buffer (`#`) tracking
diff --git a/V0.1.md b/V0.1.md
index 898bc0d..7690706 100644
--- a/V0.1.md
+++ b/V0.1.md
@@ -20,7 +20,7 @@
 - [ ] Configuration file support (~/.gimrc or similar)
 - [ ] Persistent undo history
 - [ ] Line wrapping display option
-- [ ] Handle large files gracefully (>10k lines)
+- [ ] Handle large files gracefully (>10k lines) [Pretty sure this is fine]
 
 ## Nice to Have (Polish)
 - [ ] Incremental search (search as you type)