diff --git a/packages/ember-runtime/lib/computed/array_computed.js b/packages/ember-runtime/lib/computed/array_computed.js
index 4285291f93a..7873f91209c 100644
--- a/packages/ember-runtime/lib/computed/array_computed.js
+++ b/packages/ember-runtime/lib/computed/array_computed.js
@@ -12,6 +12,7 @@ var a_slice = [].slice;
 function ArrayComputedProperty() {
   var cp = this;
 
+  this._isArrayComputed = true;
   ReduceComputedProperty.apply(this, arguments);
 
   this._getter = (function(reduceFunc) {
@@ -163,6 +164,7 @@ ArrayComputedProperty.prototype.didChange = function (obj, keyName) {
   @param {String} [dependentKeys*]
   @param {Object} options
   @return {Ember.ComputedProperty}
+  @deprecated
   @private
 */
 function arrayComputed(options) {
diff --git a/packages/ember-runtime/lib/computed/reduce_computed.js b/packages/ember-runtime/lib/computed/reduce_computed.js
index fbd1ba79366..c17499ac88b 100644
--- a/packages/ember-runtime/lib/computed/reduce_computed.js
+++ b/packages/ember-runtime/lib/computed/reduce_computed.js
@@ -478,6 +478,12 @@ export { ReduceComputedProperty }; // TODO: default export
 function ReduceComputedProperty(options) {
   var cp = this;
 
+  if (this._isArrayComputed) {
+    Ember.deprecate('Ember.arrayComputed is deprecated. Replace it with plain array methods');
+  } else {
+    Ember.deprecate('Ember.reduceComputed is deprecated. Replace it with plain array methods');
+  }
+
   this.options = options;
   this._dependentKeys = null;
   this._cacheable = true;
@@ -841,6 +847,7 @@ ReduceComputedProperty.prototype.property = function () {
   @param {String} [dependentKeys*]
   @param {Object} options
   @return {Ember.ComputedProperty}
+  @deprecated
   @public
 */
 export function reduceComputed(options) {
diff --git a/packages/ember-runtime/tests/computed/reduce_computed_test.js b/packages/ember-runtime/tests/computed/reduce_computed_test.js
index ef3af931fcb..8b6c85c1318 100644
--- a/packages/ember-runtime/tests/computed/reduce_computed_test.js
+++ b/packages/ember-runtime/tests/computed/reduce_computed_test.js
@@ -83,6 +83,15 @@ QUnit.module('arrayComputed', {
   }
 });
 
+QUnit.test("reduceComputed is deprecated", function() {
+  expectDeprecation(/Ember.reduceComputed is deprecated/);
+  reduceComputed({ initialValue: 0 });
+});
+
+QUnit.test("arrayComputed is deprecated", function() {
+  expectDeprecation(/Ember.arrayComputed is deprecated/);
+  arrayComputed({});
+});
 
 QUnit.test("array computed properties are instances of ComputedProperty", function() {
   ok(arrayComputed({}) instanceof ComputedProperty);