diff --git a/spec/dependentObservableBehaviors.js b/spec/dependentObservableBehaviors.js
index 52e6b9067..2589726cb 100644
--- a/spec/dependentObservableBehaviors.js
+++ b/spec/dependentObservableBehaviors.js
@@ -15,6 +15,11 @@ describe('Dependent Observable', function() {
         expect(ko.isComputed(instance)).toEqual(true);
     });
 
+    it('Should advertise that instances are not pure computed', function () {
+        var instance = ko.computed(function () { });
+        expect(ko.isPureComputed(instance)).toEqual(false);
+    });
+
     it('Should advertise that instances cannot have values written to them', function () {
         var instance = ko.computed(function () { });
         expect(ko.isWriteableObservable(instance)).toEqual(false);
diff --git a/spec/observableBehaviors.js b/spec/observableBehaviors.js
index 476377a9b..31c312c6e 100644
--- a/spec/observableBehaviors.js
+++ b/spec/observableBehaviors.js
@@ -10,6 +10,11 @@ describe('Observable', function() {
         expect(ko.isObservable(instance)).toEqual(true);
     });
 
+    it('Should advertise that instances are not pure computed', function () {
+        var instance = ko.observable();
+        expect(ko.isPureComputed(instance)).toEqual(false);
+    });
+
     it('Should be able to write values to it', function () {
         var instance = new ko.observable();
         instance(123);
diff --git a/spec/pureComputedBehaviors.js b/spec/pureComputedBehaviors.js
index 49d31fc1d..84ad389b1 100644
--- a/spec/pureComputedBehaviors.js
+++ b/spec/pureComputedBehaviors.js
@@ -5,6 +5,11 @@ describe('Pure Computed', function() {
         expect(ko.isComputed(computed)).toEqual(true);
     });
 
+    it('Should advertise that instances are pure computed', function () {
+        var instance = ko.pureComputed(function () { });
+        expect(ko.isPureComputed(instance)).toEqual(true);
+    });
+
     it('Should require an evaluator function as constructor param', function () {
         expect(function () { ko.pureComputed(); }).toThrow();
     });
diff --git a/src/subscribables/dependentObservable.js b/src/subscribables/dependentObservable.js
index 22f799f98..49119c110 100644
--- a/src/subscribables/dependentObservable.js
+++ b/src/subscribables/dependentObservable.js
@@ -440,9 +440,15 @@ ko.isComputed = function (instance) {
     return ko.hasPrototype(instance, ko.computed);
 };
 
+ko.isPureComputed = function (instance) {
+    return ko.hasPrototype(instance, ko.computed) &&
+        instance.getVersion === pureComputedOverrides.getVersion;
+}
+
 ko.exportSymbol('computed', ko.computed);
 ko.exportSymbol('dependentObservable', ko.computed);    // export ko.dependentObservable for backwards compatibility (1.x)
 ko.exportSymbol('isComputed', ko.isComputed);
+ko.exportSymbol('isPureComputed', ko.isPureComputed);
 ko.exportSymbol('computed.fn', computedFn);
 ko.exportProperty(computedFn, 'peek', computedFn.peek);
 ko.exportProperty(computedFn, 'dispose', computedFn.dispose);