diff --git a/README.md b/README.md
index 9e06d2e2..c053b961 100644
--- a/README.md
+++ b/README.md
@@ -24,38 +24,38 @@ can make pull requests to that repo during the Task 3 activity during the lab.
 During lab, you should not fork directly from https://github.com/CSC207-2023F-UofT/Lab2.
 If you miss the lab and work on this after, you should use this URL though.
 
-- [ ] Make a fork of this repo and clone a local copy (as you did in Lab 1).
+- [X] Make a fork of this repo and clone a local copy (as you did in Lab 1).
   - Important: make sure to uncheck the option to only fork the main branch, as the repo
   contains some branches you will use in this lab.
 
 # TASK 1: Your first branch
 
-- [ ] Create and checkout a new branch called `task_1` using either IntelliJ or the Terminal:
+- [X] Create and checkout a new branch called `task_1` using either IntelliJ or the Terminal:
   - IntelliJ: `Git -> New branch...`
   - Terminal: `git checkout -b task_1`
   - After, you can check `git status` or the Log tab of the Git tool window in IntelliJ to see
   that you are now on the `task_1` branch.
-- [ ] Open the TODO tool window (`View -> Tool Windows -> TODO`) and click on the TASK 1 TODO listed.
-- [ ] Complete the TASK 1 TODO and commit your changes to this file (checking off the
+- [X] Open the TODO tool window (`View -> Tool Windows -> TODO`) and click on the TASK 1 TODO listed.
+- [X] Complete the TASK 1 TODO and commit your changes to this file (checking off the
 completed items so far) and `DataTypes.java` (remove the word TODO and your bug fix).
   - talk to those around you or your TA, then see the hints at the bottom of the readme if you get stuck.
-- [ ] Now, we'll merge the `task_1` branch back into `main`. When merging,
+- [X] Now, we'll merge the `task_1` branch back into `main`. When merging,
 you need to be currently on the branch you are trying to merge into, so we'll first checkout the main
 branch:
   - IntelliJ: `Git -> branches... -> main -> Checkout`
   - Terminal: `git checkout main`
 Note: everything we've done has been local to our repository and have not pushed anything yet.
-- [ ] We are back on `main`, so we can now do the merge and complete our work!
+- [X] We are back on `main`, so we can now do the merge and complete our work!
   - IntelliJ: `Git -> Merge... -> task_1 -> Merge`
   - Terminal: `git merge task_1`
 
 You should now see the changes you had made are also in the `main` branch.
 
-- [ ] Now, we'll want to clean up since we are done with our `task_1` branch.
+- [X] Now, we'll want to clean up since we are done with our `task_1` branch.
   - IntelliJ: `Git -> branches... -> task_1 -> Delete`
   - Terminal: `git branch -d task_1`
 
-- [ ] Last step, we'll push our changes to the remote repository to share our work! (As we did in Lab 1.)
+- [X] Last step, we'll push our changes to the remote repository to share our work! (As we did in Lab 1.)
   - we suggest you check off this last item, commit that change (just right on main is fine;
   no need to branch for this little step), then push your code. Check GitHub to ensure you can
   see your changes.
diff --git a/src/DataTypes.java b/src/DataTypes.java
index 4f807c1f..1c5415a5 100644
--- a/src/DataTypes.java
+++ b/src/DataTypes.java
@@ -1,10 +1,10 @@
 import java.util.List;
 
 public class DataTypes {
-    // TODO TASK 1: fix this code so that it passes the test in DataTypesTest.java
+    // TASK 1: fix this code so that it passes the test in DataTypesTest.java
     public static long sum(List<Integer> numbers) {
 
-        int s = 0;
+        long s = 0L;
         // below is a "foreach" loop which iterates through numbers
         for (int x : numbers) {
             s += x;