diff --git a/README.md b/README.md
index dada93e..de22487 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,6 @@ yarn add smpte.js
 
 ### Example
 Using `ES6` sintax:
-
 ```javascript
 import SMPTE from 'smpte.js';
 
@@ -32,6 +31,18 @@ console.log(
     .toString('00:00:00;00')
 );
 // 00:00:01;03
+
+let invalidTm = new SMPTE('00:01:00:23', 24, true);
+// Error: Only 29.97 frame rate has drop frame support
+
+let invalidTm = new SMPTE('00:01:00:59', 60, false);
+// Error: Frame rate not supported
+
+let invalidTm = new SMPTE(-1440, 24, false);
+// Error: Negative frames not supported
+
+let invalidTm = new SMPTE('00:00:00:24', 24, false);
+// Error: Invalid timecode
 ```
 
 ### Object Instantiation
@@ -76,50 +87,122 @@ SMPTE objects provide the following properties once an object is created:
 
 Each SMPTE object provides the following methods:
 
-#### `addFromSeconds(seconds)` - [**chainable**](#chainable)
+#### `addFromSeconds(seconds)`
 Adds a number of seconds to the current timecode object.
 * `seconds`: `Number` indicating the seconds to be added.
+* `return`: The reference to the altered `SMPTE` object
+##### Example:
+```javascript
+let tc = SMPTE.fromSeconds(2, 24, false);
+console.log(tc.addFromSeconds(2).toString())
+// 00:00:04:00
+```
 
-#### `subtractFromSeconds(seconds)` - [**chainable**](#chainable)
+#### `subtractFromSeconds(seconds)`
 Substracts a timecode or a frame count from the current SMPTE object.
 * `seconds`: `Number` indicating the seconds to be subtracted.
+* `return`: The reference to the altered `SMPTE` object
+##### Example:
+```javascript
+let tc = SMPTE.fromSeconds(2, 24, false);
+console.log(tc.subtractFromSeconds(2).toString())
+// 00:00:00:00
+```
 
-#### `add(time, operation = 1)` - [**chainable**](#chainable)
+#### `add(time, operation = 1)`
 Adds a timecode or a frame count to the current SMPTE object.
 * `time`: `Number|String|SMPTE` indicating the value to be added.
 * `operation`: `Number` used to get the sign of the `time`.
+* `return`: The reference to the altered `SMPTE` object
+##### Example:
+```javascript
+let tc = SMPTE.fromTimecode('00:01:00:00', 24, false);
+console.log(tc.add('00:00:30:00').toString())
+// 00:01:30:00
+```
 
-#### `subtract(time)` - [**chainable**](#chainable)
+#### `subtract(time)`
 Substracts a timecode or a frame count from the current SMPTE object.
 * `time`: `Number|String|SMPTE` indicating the value to be subtracted.
+* `return`: The reference to the altered `SMPTE` object
+##### Example:
+```javascript
+let tc = SMPTE.fromTimecode('00:00:01:00', 24, false);
+console.log(tc.subtract(4).toString())
+// 00:00:00:20
+```
 
 #### `toString(format = undefined)`
 Returns a string with the SMPTE timecode representation.
 * `format`: `String` mask to form the string.
+* `return`: Timecode `string`.
+##### Example:
+```javascript
+console.log(new SMPTE(48, 24, false).toString())
+// 00:00:02:00
+```
 
 #### `toDate()`
 Converts a SMPTE object to a date object.
+* `return`: The respective `Date` object.
+```javascript
+console.log(new SMPTE(48, 24, false).toDate().getSeconds())
+// 2
+```
 
 #### `isTimecodeFormatValid(timecode, df)` - **static**
 Checks if a timecode string is in a valid format.
 * `timecode`: `String` to be evaluated.
 * `df`: `Boolean` indicating if is drop frame representation.
+* `return`: `Boolean`.
+```javascript
+console.log(SMPTE.isTimecodeFormatValid('24:59:59:29', false));
+// false
+console.log(SMPTE.isTimecodeFormatValid('23:59:59:29', false));
+// true
+
+console.log(SMPTE.isTimecodeFormatValid('24:59:59:29', true));
+// false
+console.log(SMPTE.isTimecodeFormatValid('24:59:59;29', true));
+// true
+```
 
 #### `isValidTimecode(timecode, fr = defaults.frameRate, df = defaults.dropFrame)` - **static**
 Checks if a timecode is valid according to SMPTE standard.
 * `timecode`: `String` to be evaluated.
 * `fr`: `Number` indicating the frame rate.
 * `df`: `Boolean` indicating if is drop frame representation.
+* `return`: `Boolean`.
+```javascript
+console.log(SMPTE.isValidTimecode('23:59:59:24', 24, false));
+// false
+console.log(SMPTE.isValidTimecode('23:59:59:23', 24, false));
+// true
+```
 
 #### `frameCountFromTimecode(timecode, fr = defaults.frameRate, df = defaults.dropFrame)` - **static**
 Gets the frame count given a timecode string.
 * `timecode`: `String` timecode.
 * `fr`: `Number` indicating the frame rate.
 * `df`: `Boolean` indicating if is drop frame representation.
+* `return`: `Number`.
+```javascript
+console.log(SMPTE.frameCountFromTimecode('00:01:00;02', 29.97, true))
+// 1800
+console.log(SMPTE.frameCountFromTimecode('00:01:00:00', 29.97, false))
+// 1800
+```
 
 #### `isFramerateSupported(framerate)` - **static**
 Checks if a frame rate is supported.
 * `framerate`: `Number` indicating the frame rate.
+* `return`: `Boolean`.
+```javascript
+console.log(SMPTE.isFramerateSupported(59.94))
+// false
+console.log(SMPTE.isFramerateSupported(25))
+// true
+```
 
 ### Default values
 You can easily change the default value accessing the static `default` object from the SMPTE class and change the `frameRate` or the `dropFrame` property.
@@ -131,13 +214,8 @@ SMPTE.defaults.frameRate = 29.97;
 SMPTE.defaults.dropFrame = true;
 ```
 
-## Definitions
-
-### [Chainable](https://en.wikipedia.org/wiki/Method_chaining)
-Returns an object, allowing the calls to be chained together in a single statement without requiring variables to store the intermediate results.
-
 ## Contributing
 All contribution is welcome, please feel free to open tickets and pull requests.
 
 ## License
-[MIT.](https://github.com/fireworkweb/smpte.js/blob/master/LICENSE)
+[MIT.](LICENSE)