If you don't do this, you'll receive this error:
```
❯ zeppelin npm install zeppelin-solidity
npm WARN saveError ENOENT: no such file or directory, open '/Users/et/package.json'
npm WARN enoent ENOENT: no such file or directory, open '/Users/et/package.json'
npm WARN et No description
npm WARN et No repository field.
npm WARN et No README data
npm WARN et No license field.
+ zeppelin-solidity@1.3.0
updated 1 package in 0.677s
```
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