diff --git a/Cargo.toml b/Cargo.toml
index 0e857de..0005e9d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -11,6 +11,7 @@ missing_docs = "warn"
 
 [lints.rustdoc]
 missing_doc_code_examples = "warn"
+private_doc_tests = "warn"
 
 [lints.clippy]
 missing_docs_in_private_items = "warn"