1 files changed, 4 insertions, 2 deletions
diff --git a/Cargo.toml b/Cargo.toml
index 6124744..e94367f 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -14,8 +14,10 @@ thiserror = "1.0"
 
 futures = { version = "0.3.8", optional = true }
 async-trait = { version = "0.1.42", optional = true }
+tokio = { version = "0.2", features = ["rt-threaded", "tcp", "io-util", "macros", "dns"], optional = true }
 
 [features]
-default = ["async"]
+default = []
 
-async = ["futures", "async-trait"]
-\ No newline at end of file
+futures-io = ["futures", "async-trait"]
+tokio-io = ["tokio", "async-trait"]
+\ No newline at end of file