diff --git a/.github/workflows/pythonapp.yml b/.github/workflows/pythonapp.yml
index 16156ec..9a4ac3b 100644
--- a/.github/workflows/pythonapp.yml
+++ b/.github/workflows/pythonapp.yml
@@ -8,14 +8,14 @@ on: [push, pull_request]
 
 jobs:
   build:
-    runs-on: ubuntu-22.04
+    runs-on: ubuntu-latest
     timeout-minutes: 5
 
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: '3.11'
 
       - name: Install dependencies
         run: |
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
deleted file mode 100644
index 5d2c10b..0000000
--- a/.gitlab-ci.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-image: python:3.7
-
-test:
-  script:
-  # Install Python packages required to run code. Add any additional
-  # packages your code needs require here.
-  - pip install dateutils flake8 matplotlib numpy pytest requests
-
-  # flake8 static code and style testing. Enable for extra testing.
-  # - python -m flake8 .
-
-    # Run unit tests
-  - python -m pytest -v .
-
-  # Run deliverables. Add your deliverables to the test system here.
-  - python Task1A.py
-
-  - python Task2A.py
-  - python Task2D.py
diff --git a/floodsystem/datafetcher.py b/floodsystem/datafetcher.py
index 4738bff..2a87582 100644
--- a/floodsystem/datafetcher.py
+++ b/floodsystem/datafetcher.py
@@ -46,6 +46,12 @@ def fetch_station_data(use_cache=True):
     retrieval over the Internet and avoids excessive calls to the
     Environment Agency service.
 
+    Args:
+        use_cache: If ``True``, use file cache. Otherwise fetch data
+            over the Internet.
+
+    Returns:
+        River level data.
     """
 
     # URL for retrieving data for active stations with river level
diff --git a/floodsystem/station.py b/floodsystem/station.py
index cee0c85..63ab9db 100644
--- a/floodsystem/station.py
+++ b/floodsystem/station.py
@@ -12,6 +12,7 @@ class MonitoringStation:
 
     def __init__(self, station_id, measure_id, label, coord, typical_range,
                  river, town):
+        """Create a monitoring station."""
 
         self.station_id = station_id
         self.measure_id = measure_id
diff --git a/floodsystem/stationdata.py b/floodsystem/stationdata.py
index 1e3e61e..fc4ec4f 100644
--- a/floodsystem/stationdata.py
+++ b/floodsystem/stationdata.py
@@ -1,7 +1,7 @@
 # Copyright (C) 2018 Garth N. Wells
 #
 # SPDX-License-Identifier: MIT
-"""This module provides interface for extracting statiob data from
+"""This module provides interface for extracting station data from
 JSON objects fetched from the Internet and
 
 """
diff --git a/floodsystem/utils.py b/floodsystem/utils.py
index f049d01..8771173 100644
--- a/floodsystem/utils.py
+++ b/floodsystem/utils.py
@@ -10,12 +10,12 @@ def sorted_by_key(x, i, reverse=False):
     """For a list of lists/tuples, return list sorted by the ith
     component of the list/tuple, E.g.
 
-    Sort on first entry of tuple:
+    Sort on first entry of tuple::
 
       > sorted_by_key([(1, 2), (5, 1]), 0)
       >>> [(1, 2), (5, 1)]
 
-    Sort on second entry of tuple:
+    Sort on second entry of tuple::
 
       > sorted_by_key([(1, 2), (5, 1]), 1)
       >>> [(5, 1), (1, 2)]