diff --git a/src/ol/interaction/condition.js b/src/ol/interaction/condition.js
index 81a34c4f63..3644843ddc 100644
--- a/src/ol/interaction/condition.js
+++ b/src/ol/interaction/condition.js
@@ -20,6 +20,18 @@ ol.interaction.condition.altKeyOnly = function(browserEvent) {
 };
 
 
+/**
+ * @param {goog.events.BrowserEvent} browserEvent Browser event.
+ * @return {boolean} True if only the alt and shift keys are pressed.
+ */
+ol.interaction.condition.altShiftKeysOnly = function(browserEvent) {
+  return (
+      browserEvent.altKey &&
+      !browserEvent.platformModifierKey &&
+      browserEvent.shiftKey);
+};
+
+
 /**
  * @param {goog.events.BrowserEvent} browserEvent Browser event.
  * @return {boolean} True if only the no modifier keys are pressed.