diff --git a/tokio/src/runtime/runtime.rs b/tokio/src/runtime/runtime.rs
index 3d4fd67884d..9ede0a7b0b5 100644
--- a/tokio/src/runtime/runtime.rs
+++ b/tokio/src/runtime/runtime.rs
@@ -138,6 +138,9 @@ impl Runtime {
     /// The returned handle can be used to spawn tasks that run on this runtime, and can
     /// be cloned to allow moving the `Handle` to other threads.
     ///
+    /// Calling [`Handle::block_on`] on a handle to a `current_thread` runtime is error-prone.
+    /// Refer to the documentation of [`Handle::block_on`] for more.
+    ///
     /// # Examples
     ///
     /// ```