diff --git a/src/ol/interaction/dragboxinteraction.js b/src/ol/interaction/dragboxinteraction.js
index 50baef0f9f..3a455e0ded 100644
--- a/src/ol/interaction/dragboxinteraction.js
+++ b/src/ol/interaction/dragboxinteraction.js
@@ -69,9 +69,12 @@ goog.inherits(ol.DragBoxEvent, goog.events.Event);
 
 /**
  * @classdesc
- * Allows the user to zoom the map by clicking and dragging on the map,
+ * Allows the user to draw a vector box by clicking and dragging on the map,
  * normally combined with an {@link ol.events.condition} that limits
- * it to when the shift key is held down.
+ * it to when the shift or other key is held down. This is used, for example,
+ * for zooming to a specific area of the map
+ * (see {@link ol.interaction.DragZoom} and
+ * {@link ol.interaction.DragRotateAndZoom}).
  *
  * This interaction is only supported for mouse devices.
  *
diff --git a/src/ol/interaction/dragzoominteraction.js b/src/ol/interaction/dragzoominteraction.js
index c51d0d67f2..6074caba7b 100644
--- a/src/ol/interaction/dragzoominteraction.js
+++ b/src/ol/interaction/dragzoominteraction.js
@@ -15,7 +15,7 @@ goog.require('ol.style.Style');
  * @classdesc
  * Allows the user to zoom the map by clicking and dragging on the map,
  * normally combined with an {@link ol.events.condition} that limits
- * it to when the shift key is held down.
+ * it to when a key, shift by default, is held down.
  *
  * @constructor
  * @extends {ol.interaction.DragBox}
diff --git a/src/ol/interaction/interaction.js b/src/ol/interaction/interaction.js
index 9e5a651d76..0899e56141 100644
--- a/src/ol/interaction/interaction.js
+++ b/src/ol/interaction/interaction.js
@@ -19,6 +19,8 @@ goog.require('ol.easing');
  * For example, {@link ol.interaction.KeyboardZoom} is functionally the same as
  * {@link ol.control.Zoom}, but triggered by a keyboard event not a button
  * element event.
+ * Although interactions do not have a DOM element, some of them do render
+ * vectors and so are visible on the screen.
  *
  * @constructor
  * @extends {ol.Observable}
diff --git a/src/ol/interaction/interactiondefaults.js b/src/ol/interaction/interactiondefaults.js
index 7ff14ce8ae..a9976ef80c 100644
--- a/src/ol/interaction/interactiondefaults.js
+++ b/src/ol/interaction/interactiondefaults.js
@@ -32,6 +32,9 @@ goog.require('ol.interaction.PinchZoom');
  * * {@link ol.interaction.MouseWheelZoom}
  * * {@link ol.interaction.DragZoom}
  *
+ * Note that DragZoom renders a box as a vector polygon, so this interaction
+ * should be excluded if you want a build with no vector support.
+ *
  * @param {olx.interaction.DefaultsOptions=} opt_options Defaults options.
  * @return {ol.Collection} A collection of interactions to be used with
  * the ol.Map constructor's interactions option.