Incorrect "invalid configuration" message for warning rule

[s0ph1e]

What version of ESLint are you using? v2.4.0

Please show your full configuration:

rules:
  curly: "warning"

What did you do? Please include the actual source code causing the issue.
Run eslint app.js

What did you expect to happen?
According to documentaion error message should say
Severity should be one of the following: 0 = off, 1 = warn, 2 = error (you passed '"warning"')
instead of
Severity should be one of the following: 0 = off, 1 = warning, 2 = error (you passed '"warning"')

What actually happened? Please include the actual, raw output from ESLint.

Error: /home/administrator/Projects/my/test/.eslintrc.yml:
    Configuration for rule "curly" is invalid:
    Severity should be one of the following: 0 = off, 1 = warning, 2 = error (you passed '"warning"').

    at validateRuleOptions (/usr/lib/node_modules/eslint/lib/config/config-validator.js:118:15)
    at /usr/lib/node_modules/eslint/lib/config/config-validator.js:164:13
    at Array.forEach (native)
    at Object.validate (/usr/lib/node_modules/eslint/lib/config/config-validator.js:163:35)
    at Object.load (/usr/lib/node_modules/eslint/lib/config/config-file.js:457:19)
    at loadConfig (/usr/lib/node_modules/eslint/lib/config.js:67:33)
    at getLocalConfig (/usr/lib/node_modules/eslint/lib/config.js:129:23)
    at Config.getConfig (/usr/lib/node_modules/eslint/lib/config.js:223:22)
    at processText (/usr/lib/node_modules/eslint/lib/cli-engine.js:155:27)
    at processFile (/usr/lib/node_modules/eslint/lib/cli-engine.js:227:18)

[platinumazure]

Confirmed here.