diff --git a/pyproject.toml b/pyproject.toml
index fb56453..dd6565c 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -38,3 +38,6 @@ filterwarnings = [
   # See: aio-libs/aiohttp#7545
   "ignore:.*datetime.utcfromtimestamp().*:DeprecationWarning",
 ]
+
+[tool.flit.sdist]
+include = ["docs", "tests"]