diff --git a/pyproject.toml b/pyproject.toml
index 0334a6842..b26e2f609 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -19,6 +19,7 @@ classifiers = [
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
 ]
+# This list must be in synq with the ./requirements.in file!
 dependencies = [
   "iso3166",
   "pydantic>=2.0.0",