diff --git a/rumqttc/src/lib.rs b/rumqttc/src/lib.rs
index 0c2d67fef..07694ffaf 100644
--- a/rumqttc/src/lib.rs
+++ b/rumqttc/src/lib.rs
@@ -324,7 +324,7 @@ impl Transport {
 pub enum TlsConfiguration {
     #[cfg(feature = "use-rustls")]
     Simple {
-        /// connection method
+        /// ca certificate
         ca: Vec<u8>,
         /// alpn settings
         alpn: Option<Vec<Vec<u8>>>,