diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index bb4f94f..96741bb 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,23 +1,24 @@
-name: CI
+name: CI # name of workflow
 
-on: [push]
+on: [push] # trigger
 
-jobs:
+jobs: # jobs
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest # runner
     steps:
 
       - name: Checkout repository
         uses: actions/checkout@v3
 
-      - name: Setup python
+      - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: "3.9" 
+          python-version: "3.11"
 
       - name: Install requirements
         run: pip install -r 01-ci-lab/requirements.txt
 
+
       - name: Run tests
         run: pytest 01-ci-lab
 
diff --git a/01-ci-lab/app/calculator.py b/01-ci-lab/app/calculator.py
index 7382287..82a78aa 100644
--- a/01-ci-lab/app/calculator.py
+++ b/01-ci-lab/app/calculator.py
@@ -1,5 +1,5 @@
 def add(a, b):
-    return a + b
+    return a + b  # returns sum
 
 def divide(a, b):
-    return a / b
\ No newline at end of file
+    return a / b  # returns division
\ No newline at end of file