diff --git a/README.md b/README.md
index d0eab94..e41c514 100644
--- a/README.md
+++ b/README.md
@@ -5,8 +5,8 @@ This a monorepo of OBOS' open source frontend modules.
 
 ## Packages
 
-* [format](./packages/format)
-* [validation](./packages/validation)
+* [format](./packages/format) - A collection of formatting methods for 🇳🇴 and 🇸🇪.
+* [validation](./packages/validation) - A collection of validation methods for 🇳🇴 and 🇸🇪.
 
 ## Contributing
 
@@ -34,4 +34,4 @@ pnpm build
 
 ### Releases and changelogs
 
-We use an automated release process based on [changesets](https://github.com/changesets/changesets) and a [Github action](./.github/workflows/release.yml) to version, release and publish the packages. Meaningful changes should be documented by running pnpm changeset and be a part of the pull request. Remember to follow semver.
+We use an automated release process based on [changesets](https://github.com/changesets/changesets) and a [Github action](./.github/workflows/release.yml) to version, release and publish the packages. Meaningful changes should be documented by running `pnpm changeset` and be a part of the pull request. Remember to follow semver.
diff --git a/packages/validation/README.md b/packages/validation/README.md
index 70e44ce..d378576 100644
--- a/packages/validation/README.md
+++ b/packages/validation/README.md
@@ -36,10 +36,13 @@ validateOrganizationNumber('000') // => false
 
 ## Strictness and formatting characters
 
-The methods are "strict" by default, meaning no formatting characters in the input is allowed.
-This is preferrable, for instance when doing server-side validation, where the input is often expected to be a "clean" value.
+The methods are "strict" by default, meaning no formatting characters in the input is allowed. This even applies to separators such as in Swedish national identity numbers.
 
-If you want to allow formatting characters in the input, you can pass `allowFormatting: true` in the options object to the method.
+When doing server-side validation, for instance, before insertion into a database, strictness is often preferrable. The value is often expected to be a "clean" value in standardized format.
+
+On the client side, formatting characters could be allowed, as they are more user-friendly, for instance, allowing the user to input their phone number in their preferred format.
+
+If you want to allow formatting characters in the value, you can pass `allowFormatting: true` in the options object to the method.
 
 
 ```js
@@ -56,13 +59,103 @@ validateOrganizationNumber('937 052 766', { allowFormatting: true }) // true;
 
 ## Methods
 
-* validateNationalIdentityNumber
-* validatePostalCode
-* validatePhoneNumber
-  * supports mobileOnly option
-* validateOrganizationNumber
-  * Check digit verification is currently only implemented for Norwegian organization numbers. For Swedish organiation numbers, we only check the length of the input. PRs are welcome to fix this.
-* validateObosMembershipNumber
+### validateNationalIdentityNumber()
+
+Validates that the value is a valid national identity number.
+
+Validation is done for the both checksum and if the date is a valid date.
+It accepts both fødselsnummer and d-nummer for Norway, and personnummer and samordningsnummer for Sweden.
+
+By default, both the short (10 digit) and long (12 digit) format is allowed for Sweden. You can use the `format` option to specify the format to validate.
+
+```js
+// 🇳🇴 example
+import { validateNationalIdenityNumber } from '@obosbbl/validation/no';
+validateNationalIdenityNumber('DDMMYYXXXX') // => true
+
+// 🇸🇪 example
+import { validateNationalIdentityNumber } from "@obosbbl/validation/se";
+// short
+validatePersonalIdentityNumber('YYMMDDXXXX') // => true
+// long
+validateOrganizationNumber('YYYYMMDDXXXX'') // => true
+
+// separator (formatting) is important for Swedish national identity numbers
+validatePersonalIdentityNumber('YYMMDD-XXXX', { allowFormatting: true }) // => true
+validateOrganizationNumber('YYYY-MMDDXXXX', { allowFormatting: true })) // => true
+
+// specific format
+validatePersonalIdentityNumber('YYMMDDXXXX', { format: 'short' }) // => true
+validatePersonalIdentityNumber('YYMMDDXXXX', { format: 'long' }) // => false
+
+validatePersonalIdentityNumber('YYYYMMDDXXXX', { format: 'long' }) // => true
+```
+
+> [!TIP]
+> Did you know that you cannot assume that the date in the number is person's date of birth? See [Skatteetaten fødselsnummer](https://www.skatteetaten.no/person/folkeregister/identitetsnummer/fodselsnummer/).
+
+### validatePhoneNumber()
+
+Validates that the value is a valid phone number. Specify `mobileOnly` to only allow mobile numbers.
+
+```js
+// 🇳🇴 example
+import { validatePhoneNumber } from '@obosbbl/validation/no';
+validatePhoneNumber('00000000') // => true
+validatePhoneNumber('90000000', { mobileOnly: true }) // => true
+
+// 🇸🇪 example
+import { validatePhoneNumber } from '@obosbbl/validation/se';
+validatePhoneNumber('00000000') // => true
+validatePhoneNumber('000000000') // => true
+validatePhoneNumber('0000000000') // => true
+validatePhoneNumber('0700000000', { mobileOnly: true }) // => true
+```
+
+### validatePostalCode()
+
+Validates that the value is a valid postal code.
+
+```js
+// 🇳🇴 example
+import { validatePostalCode } from '@obosbbl/validation/no';
+validatePostalCode('0000') // => true
+
+// 🇸🇪 example
+import { validatePostalCode } from '@obosbbl/validation/se';
+validatePostalCode('00000') // => true
+```
+
+### validateOrganizationNumber()
+
+Validates that the value is a valid organization number. Validates the checksum of the number.
+
+```js
+// 🇳🇴 example
+import { validateOrganizationNumber } from '@obosbbl/validation/no';
+validateOrganizationNumber('937052766') // => true
+
+// 🇸🇪 example
+import { validateOrganizationNumber } from '@obosbbl/validation/se';
+validateOrganizationNumber('5592221054') // => true
+```
+
+### validateObosMembershipNumber()
+
+Validates that the value is a valid OBOS membership number.
+
+> [!NOTE]
+> There is no difference between a Norwegian and Swedish OBOS membership number. The method in use is in fact the same one, re-exported for the different locales.
+
+```js
+// 🇳🇴 example
+import { validateObosMembershipNumber } from '@obosbbl/validation/no';
+validateObosMembershipNumber('0000000') // => true
+
+// 🇸🇪 example
+import { validateObosMembershipNumber } from '@obosbbl/validation/se';
+validateObosMembershipNumber('0000000') // => true
+```
 
 
 ## Example usage with Zod
diff --git a/packages/validation/src/no.ts b/packages/validation/src/no.ts
index 313958f..fe99f4c 100644
--- a/packages/validation/src/no.ts
+++ b/packages/validation/src/no.ts
@@ -71,7 +71,7 @@ type OrganizationNumberOptions = ValidatorOptions;
  */
 export function validateOrganizationNumber(
   value: string,
-  options: PhoneNumberOptions = {},
+  options: OrganizationNumberOptions = {},
 ): boolean {
   if (options.allowFormatting) {
     // biome-ignore lint/style/noParameterAssign: