> For AI agents: [llms.txt](https://docs.trustedauth.com/llms.txt) provides a Markdown index of this documentation.

# Add Authentication Context References

Authentication Context References (ACRs) are labels that are used by SAML or OIDC and OAuth Identity Providers to set the type of authentication that should take place to allow access. IDaaS provides a number of System ACRs, but you can also add custom ACRs. In IDaaS, ACRs are used in resource rules to determine the type of authentication required to either allow or deny access to the protected Identity Provider.

## Add custom ACRs

1. Click Menu icon **>** **Configuration > Authentication Context References**. The **Authentication Context References** page appears.
2. Under **Custom Authentication Context References**, click **Add**. The **Add Authentication Context Reference** dialog box appears.
3. Enter the **Authentication Context Reference** label.
4. Click **Add**. The ACR appears in the **Custom ACRs** list.

note

You cannot edit an ACR once it has been added. For example, if you make a typo (misspelling), you must delete the ACR and add a new one.