diff --git a/src/client/legacy/client.rs b/src/client/legacy/client.rs
index cde7a6d..91a6ca3 100644
--- a/src/client/legacy/client.rs
+++ b/src/client/legacy/client.rs
@@ -1285,7 +1285,7 @@ impl Builder {
     ///
     /// # Cargo Feature
     ///
-    /// Requires the `runtime` cargo feature to be enabled.
+    /// Requires the `tokio` cargo feature to be enabled.
     #[cfg(feature = "tokio")]
     #[cfg(feature = "http2")]
     #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
@@ -1306,7 +1306,7 @@ impl Builder {
     ///
     /// # Cargo Feature
     ///
-    /// Requires the `runtime` cargo feature to be enabled.
+    /// Requires the `tokio` cargo feature to be enabled.
     #[cfg(feature = "tokio")]
     #[cfg(feature = "http2")]
     #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
@@ -1326,7 +1326,7 @@ impl Builder {
     ///
     /// # Cargo Feature
     ///
-    /// Requires the `runtime` cargo feature to be enabled.
+    /// Requires the `tokio` cargo feature to be enabled.
     #[cfg(feature = "tokio")]
     #[cfg(feature = "http2")]
     #[cfg_attr(docsrs, doc(cfg(feature = "http2")))]
diff --git a/src/common/exec.rs b/src/common/exec.rs
index 2f23dad..40860ee 100644
--- a/src/common/exec.rs
+++ b/src/common/exec.rs
@@ -11,8 +11,7 @@ pub(crate) type BoxSendFuture = Pin<Box<dyn Future<Output = ()> + Send>>;
 // Either the user provides an executor for background tasks, or we use
 // `tokio::spawn`.
 #[derive(Clone)]
-pub enum Exec {
-    Default,
+pub(crate) enum Exec {
     Executor(Arc<dyn Executor<BoxSendFuture> + Send + Sync>),
 }
 
@@ -31,17 +30,6 @@ impl Exec {
         F: Future<Output = ()> + Send + 'static,
     {
         match *self {
-            Exec::Default => {
-                #[cfg(feature = "tcp")]
-                {
-                    tokio::task::spawn(fut);
-                }
-                #[cfg(not(feature = "tcp"))]
-                {
-                    // If no runtime, we need an executor!
-                    panic!("executor must be set")
-                }
-            }
             Exec::Executor(ref e) => {
                 e.execute(Box::pin(fut));
             }
diff --git a/src/common/mod.rs b/src/common/mod.rs
index e370dfc..160df72 100644
--- a/src/common/mod.rs
+++ b/src/common/mod.rs
@@ -10,7 +10,7 @@ macro_rules! ready {
 }
 
 pub(crate) use ready;
-pub mod exec;
+pub(crate) mod exec;
 #[cfg(feature = "client")]
 mod lazy;
 pub(crate) mod rewind;
diff --git a/src/lib.rs b/src/lib.rs
index 85f3d3b..8fa7f26 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -7,6 +7,7 @@
 pub mod client;
 mod common;
 pub mod rt;
+#[cfg(feature = "server")]
 pub mod server;
 
 mod error;