diff --git a/src/ol/easing.js b/src/ol/easing.js
index 328bffe051..14e1b90e77 100644
--- a/src/ol/easing.js
+++ b/src/ol/easing.js
@@ -4,6 +4,7 @@ goog.require('goog.fx.easing');
 
 
 /**
+ * Start slow and speed up.
  * @function
  * @param {number} t Input between 0 and 1.
  * @return {number} Output between 0 and 1.
@@ -13,6 +14,7 @@ ol.easing.easeIn = goog.fx.easing.easeIn;
 
 
 /**
+ * Start fast and slow down.
  * @function
  * @param {number} t Input between 0 and 1.
  * @return {number} Output between 0 and 1.
@@ -22,6 +24,7 @@ ol.easing.easeOut = goog.fx.easing.easeOut;
 
 
 /**
+ * Start slow, speed up, and then slow down again.
  * @function
  * @param {number} t Input between 0 and 1.
  * @return {number} Output between 0 and 1.
@@ -31,6 +34,7 @@ ol.easing.inAndOut = goog.fx.easing.inAndOut;
 
 
 /**
+ * Maintain a constant speed over time.
  * @param {number} t Input between 0 and 1.
  * @return {number} Output between 0 and 1.
  * @api
@@ -41,6 +45,9 @@ ol.easing.linear = function(t) {
 
 
 /**
+ * Start slow, speed up, and at the very end slow down again.  This has the
+ * same general behavior as {@link ol.easing.inAndOut}, but the final slowdown
+ * is delayed.
  * @param {number} t Input between 0 and 1.
  * @return {number} Output between 0 and 1.
  * @api