Merge pull request #61 from VasileDurlesteanu/master

Update README.md

Author: sudheerj

README.md

@@ -860,7 +860,7 @@ You can download the PDF and Epub version of this repository from the latest run
  **[⬆ Back to Top](#table-of-contents)**
 
 28. ### What are pipes?
- A pipe takes in data as input and transforms it to a desired output. For example, let us take a pipe to transform a component's birthday property into a human-friendly date using **date** pipe.
+ Pipes are simple functions that use [template expressions](#what-are-template-expressions) to accept data as input and transform it into a desired output. For example, let us take a pipe to transform a component's birthday property into a human-friendly date using **date** pipe.
 
  ```javascript
  import { Component } from '@angular/core';