diff --git a/src/ol/interaction/interaction.js b/src/ol/interaction/interaction.js
index 833901a8ec..2e45101983 100644
--- a/src/ol/interaction/interaction.js
+++ b/src/ol/interaction/interaction.js
@@ -57,6 +57,7 @@ goog.inherits(ol.interaction.Interaction, ol.Object);
 
 
 /**
+ * Return whether the interaction is currently active.
  * @return {boolean} `true` if the interaction is active, `false` otherwise.
  * @observable
  * @api