diff --git a/Cargo.toml b/Cargo.toml
index 2381d9a..9b2ac62 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -23,7 +23,7 @@ futures = "0.3"
 [features]
 default = ["runtime-tokio"]
 explain = ["casbin/explain"]
-logging = ["casbin/logging"]
+logging = ["casbin/logging"] 
 
 runtime-tokio = ["casbin/runtime-tokio", "tokio/sync"]
 runtime-async-std = ["casbin/runtime-async-std", "async-std/std"]