Add to docs for isISSN().

icenine457 · Oct 14, 2016 · 1751be3 · 1751be3
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diff --git a/README.md b/README.md
@@ -78,7 +78,7 @@ Passing anything other than a string is an error.
 - **isHexadecimal(str)** - check if the string is a hexadecimal number.
 - **isIP(str [, version])** - check if the string is an IP (version 4 or 6).
 - **isISBN(str [, version])** - check if the string is an ISBN (version 10 or 13).
-- **isISSN(str [, options])** - check if the string is an [ISSN](https://en.wikipedia.org/wiki/International_Standard_Serial_Number). `options` is an object which defaults to `{ case_sensitive: false, require_hyphen: false }`.
+- **isISSN(str [, options])** - check if the string is an [ISSN](https://en.wikipedia.org/wiki/International_Standard_Serial_Number). `options` is an object which defaults to `{ case_sensitive: false, require_hyphen: false }`. If `case_sensitive` is true, ISSNs with a lowercase `'x'` as the check digit are rejected.
 - **isISIN(str)** - check if the string is an [ISIN][ISIN] (stock/security identifier).
 - **isISO8601(str)** - check if the string is a valid [ISO 8601](https://en.wikipedia.org/wiki/ISO_8601) date.
 - **isIn(str, values)** - check if the string is in a array of allowed values.

diff --git a/test/validators.js b/test/validators.js
@@ -1861,7 +1861,6 @@ describe('Validators', function () {
         '2434-561x',
         '01896016',
         '20905076',
-
       ],
       invalid: [
         '0378-5954',