diff --git a/lib/datastore/entity.js b/lib/datastore/entity.js
index aa22300688c..d07ee077bb5 100644
--- a/lib/datastore/entity.js
+++ b/lib/datastore/entity.js
@@ -76,7 +76,7 @@ module.exports.keyFromKeyProto = keyFromKeyProto;
 
 var keyToKeyProto = function(datasetId, key) {
   if (key.length < 2) {
-    throw new Error("A key should contain at least a kind and an idenfier.")
+    throw new Error("A key should contain at least a kind and an identifier.")
   }
   var namespace = null, start = 0;
   if (key.length % 2 == 1) {
diff --git a/lib/datastore/index.js b/lib/datastore/index.js
index c3c7cea500e..53ebc0acb1c 100644
--- a/lib/datastore/index.js
+++ b/lib/datastore/index.js
@@ -172,7 +172,7 @@ Transaction.prototype.saveAll = function(keys, objs, callback) {
   var req = {
     mode: MODE_NON_TRANSACTIONAL,
     mutation: {
-      update: [],
+      upsert: [],
       insertAutoId: []
     }
   };
@@ -184,7 +184,7 @@ Transaction.prototype.saveAll = function(keys, objs, callback) {
     var e = entity.entityToEntityProto(objs[i]);
     e.key = entity.keyToKeyProto(this.id, keys[i]);
     if (entity.isKeyComplete(keys[i])) {
-      req.mutation.update.push(e);
+      req.mutation.upsert.push(e);
     } else {
       insertIndexes.push(i);
       req.mutation.insertAutoId.push(e);
diff --git a/test/datastore.js b/test/datastore.js
index 2d1132a869e..444b71d9ef4 100644
--- a/test/datastore.js
+++ b/test/datastore.js
@@ -163,8 +163,8 @@ describe('Dataset', function() {
     var ds = new datastore.Dataset({ projectId: 'test' });
     ds.transaction.makeReq = function(method, proto, callback) {
       assert.equal(method, 'commit');
-      assert.equal(proto.mutation.update.length, 2);
-      assert.equal(proto.mutation.update[0].properties.k.stringValue, 'v');
+      assert.equal(proto.mutation.upsert.length, 2);
+      assert.equal(proto.mutation.upsert[0].properties.k.stringValue, 'v');
       callback();
     };
     ds.saveAll([