diff --git a/tests/scripts/check-generated-files.sh b/tests/scripts/check-generated-files.sh
index 07974a2..b480837 100755
--- a/tests/scripts/check-generated-files.sh
+++ b/tests/scripts/check-generated-files.sh
@@ -109,6 +109,9 @@
 check scripts/generate_errors.pl library/error.c
 check scripts/generate_query_config.pl programs/test/query_config.c
 check scripts/generate_features.pl library/version_features.c
+# generate_visualc_files enumerates source files (library/*.c). It doesn't
+# care about their content, but the files must exist. So it must run after
+# the step that creates or updates these files.
 check scripts/generate_visualc_files.pl visualc/VS2010
 check scripts/generate_psa_constants.py programs/psa/psa_constant_names_generated.c
 check tests/scripts/generate_psa_tests.py $(tests/scripts/generate_psa_tests.py --list)