diff --git a/README.md b/README.md
index a5b470183877c2f188f8d3c2a0d312dacd18a4c8..80604a695dc008d91a7a42aef97d1faabb21b3bc 100644
--- a/README.md
+++ b/README.md
@@ -56,20 +56,19 @@ var AppleHealthKit = require('react-native-apple-healthkit');
 
 ...
 
-let healthKitOptions = {
+let options = {
     permissions: {
         read: ["Height", "Weight", "Steps", "DateOfBirth", "BodyMassIndex"],
         write: ["Weight", "Steps", "BodyMassIndex"]
     }
 };
 
-AppleHealthKit.initHealthKit(healthKitOptions, (err, res) => {
+AppleHealthKit.initHealthKit(options: Object, (err: Object, res: Object) => {
     if(err) {
         console.log("error initializing healthkit: ", err);
         return;
     }
-    console.log("HEALTHKIT INITIALIZED!");
-    // ...
+    // healthkit initialized...
 });
 
 
@@ -83,19 +82,18 @@ var _ = require('lodash');
 
 ...
 
-AppleHealthKit.getLatestWeight(null, (err, weight) => {
+AppleHealthKit.getLatestWeight(null, (err: Object, weight: number) => {
     if(err){
         console.log("error getting current weight: ", err);
         return;
     }
-    weight = _.round(weight,1);
-    // do something with the weight...
+    // use weight ...
 });
 
 ...
 
-let myWeight = 200;
-AppleHealthKit.saveWeight({value:myWeight}, (err, res) => {
+let options = {value: 200};
+AppleHealthKit.saveWeight(options: Object, (err: Object, res: Object) => {
     if(err){
         console.log("error saving weight to healthkit: ", err);
         return;
@@ -154,7 +152,7 @@ Methods
 #### **`isAvailable`** 
 check if HealthKit is available on the device
 ```javascript
-AppleHealthKit.isAvailable((err: string, available: bool) => {
+AppleHealthKit.isAvailable((err: Object, available: boolean) => {
     if(available){
         // ...
     }
@@ -165,7 +163,7 @@ ___
 #### **`initHealthKit`** 
 initialize HealthKit. this will show the HealthKit permissions prompt for any read/write permissions set in the required `options` object. 
 
-due to Apple's privacy model if an app user has previously denied a specific permission then they can not be prompted again for that same permission. the app user would have to go into the Apple Health app and grant the permission to your react-native under *sources* tab.
+due to Apple's privacy model if an app user has previously denied a specific permission then they can not be prompted again for that same permission. the app user would have to go into the Apple Health app and grant the permission to your react-native app under *sources* tab. 
 
 for any data that is read from HealthKit the status/error is the same for both. this privacy restriction results in having no knowledge of whether the permission was denied (make sure it's added to the permissions options object), or the data for the specific request was nil (ex. no steps recorded today)
 
@@ -175,7 +173,7 @@ if new read/write permissions are added to the options object then the app user
 
 `initHealthKit` requires an options object with HealthKit permission settings
 ```javascript
-let healthKitOptions = {
+let options = {
     permissions: {
         read: ["Height", "Weight", "Steps", "DateOfBirth", "BodyMassIndex"],
         write: ["Weight", "Steps", "BodyMassIndex"]
@@ -184,7 +182,7 @@ let healthKitOptions = {
 ```
 
 ```javascript
-AppleHealthKit.initHealthKit(healthKitOptions: object, (err: string, res: object) => {
+AppleHealthKit.initHealthKit(options: Object, (err: string, res: Object) => {
     if(err) {
         console.log("error initializing healthkit: ", err);
         return;
@@ -216,7 +214,7 @@ let d = new Date(2016,5,27);
 let options = {
     date: d.toISOString()
 };
-AppleHealthKit.getStepCountForDay(options, (err, steps) => {
+AppleHealthKit.getStepCountForDay(options: Object, (err: Object, steps: number) => {
     if(this._handleHealthKitError(err, 'getStepCountForDay')){
         return;
     }
@@ -238,7 +236,7 @@ let options = {
 ```
 the function will be called with an array of elements `res` containing date and step count information
 ```javascript
- AppleHealthKit.getMultiDayStepCounts(options, (err: Object, res: Array<Array<string|number>>) => {
+ AppleHealthKit.getMultiDayStepCounts(options: Object, (err: Object, res: Array<Array<string|number>>) => {
     if(this._handleHealthKitError(err, 'getMultiDayStepCounts')){
         return;
     }
@@ -262,7 +260,6 @@ AppleHealthKit.getLatestWeight(null, (err: string, weight: number) => {
         console.log("error getting latest weight: ", err);
         return;
     }
-    weight = _.round(weight,1);
     // use weight ...
 });
 ```
@@ -277,7 +274,7 @@ save a numeric weight value to HealthKit
 let options = {value: 200}
 ```
 ```javascript
-AppleHealthKit.saveWeight(options, (err, res) => {
+AppleHealthKit.saveWeight(options: Object, (err: Object, res: Object) => {
     if(err){
         console.log("error saving weight to healthkit: ", err);
         return;
@@ -310,7 +307,7 @@ save a numeric height value to HealthKit
 let options = {value: 200}
 ```
 ```javascript
-AppleHealthKit.saveHeight(options, (err, res) => {
+AppleHealthKit.saveHeight(options: Object, (err: Object, res: Object) => {
     if(this._handleHealthKitError(err, 'saveHeight')){
         return;
     }
@@ -346,7 +343,7 @@ save a numeric BMI value to HealthKit
 let options = {value: 27.2}
 ```
 ```javascript
-AppleHealthKit.saveBmi(options, (err, res) => {
+AppleHealthKit.saveBmi(options: Object, (err: Object, res: Object) => {
     if(this._handleHealthKitError(err, 'saveBmi')){
         return;
     }