diff --git a/school_project/test/models/cpu/utils/test_model.py b/school_project/test/models/cpu/utils/test_model.py
index f0d2156..16adfdc 100644
--- a/school_project/test/models/cpu/utils/test_model.py
+++ b/school_project/test/models/cpu/utils/test_model.py
@@ -1,3 +1,5 @@
+"""Unit tests for model module."""
+
 import unittest
 
 # Test XOR implementation of Model for its lesser computation time
diff --git a/school_project/test/models/cpu/utils/test_tools.py b/school_project/test/models/cpu/utils/test_tools.py
index e982063..0711317 100644
--- a/school_project/test/models/cpu/utils/test_tools.py
+++ b/school_project/test/models/cpu/utils/test_tools.py
@@ -1,3 +1,5 @@
+"""Unit tests for tools module."""
+
 import unittest
 
 from school_project.models.cpu.utils import tools
diff --git a/school_project/test/models/gpu/utils/test_model.py b/school_project/test/models/gpu/utils/test_model.py
index 688364b..9dc245e 100644
--- a/school_project/test/models/gpu/utils/test_model.py
+++ b/school_project/test/models/gpu/utils/test_model.py
@@ -1,3 +1,5 @@
+"""Unit tests for model module."""
+
 import unittest
 
 
diff --git a/school_project/test/models/gpu/utils/test_tools.py b/school_project/test/models/gpu/utils/test_tools.py
index b7ea1a6..78feeec 100644
--- a/school_project/test/models/gpu/utils/test_tools.py
+++ b/school_project/test/models/gpu/utils/test_tools.py
@@ -1,3 +1,5 @@
+"""Unit tests for tools module."""
+
 import unittest
 
 from school_project.models.gpu.utils import tools