diff --git a/scripts/mbedtls_dev/test_case.py b/scripts/mbedtls_dev/test_case.py
index d0afa592fd..8c97eefcfd 100644
--- a/scripts/mbedtls_dev/test_case.py
+++ b/scripts/mbedtls_dev/test_case.py
@@ -1,4 +1,4 @@
-"""Library for generating Mbed TLS test data.
+"""Library for constructing an Mbed TLS test case.
 """
 
 # Copyright The Mbed TLS Contributors
diff --git a/scripts/mbedtls_dev/test_data_generation.py b/scripts/mbedtls_dev/test_data_generation.py
index 5de0b885c8..2b90ef4b79 100644
--- a/scripts/mbedtls_dev/test_data_generation.py
+++ b/scripts/mbedtls_dev/test_data_generation.py
@@ -1,4 +1,7 @@
-"""Common test generation classes and main function.
+"""Common code for test data generation.
+
+This module defines classes that are of general use to automatically
+generate .data files for unit tests, as well as a main function.
 
 These are used both by generate_psa_tests.py and generate_bignum_tests.py.
 """