diff --git a/src/extensions/scratch3_boost/index.js b/src/extensions/scratch3_boost/index.js
index e6dd894da..a1be433ba 100644
--- a/src/extensions/scratch3_boost/index.js
+++ b/src/extensions/scratch3_boost/index.js
@@ -586,7 +586,7 @@ class BoostMotor {
 
     /**
      * Clear the motor states related to rotation-based commands, if any.
-     * Safe to call even when there is no pending timeout.
+     * Safe to call even when there is no pending promise function.
      * @private
      */
     _clearRotationState () {