diff --git a/tokio/src/runtime/builder.rs b/tokio/src/runtime/builder.rs
index 8f477a94004..c99b90d097d 100644
--- a/tokio/src/runtime/builder.rs
+++ b/tokio/src/runtime/builder.rs
@@ -289,11 +289,7 @@ impl Builder {
     ///
     /// The default value is the number of cores available to the system.
     ///
-    /// # Panics
-    ///
-    /// When using the `current_thread` runtime this method will panic, since
-    /// those variants do not allow setting worker thread counts.
-    ///
+    /// When using the `current_thread` runtime this method has no effect.
     ///
     /// # Examples
     ///