diff --git a/pyproject.toml b/pyproject.toml
index 936ec0f..e211b5e 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -36,7 +36,9 @@ classifiers = [
   "Topic :: Utilities",
   "Typing :: Typed",
 ]
-include = ["README.md"]
+include = [
+  { path = "README.md", format = "sdist" },
+]
 license = "MIT"
 
 [tool.poetry.dependencies]