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-rw-r--r--docs/content/doc/features/authentication.en-us.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/content/doc/features/authentication.en-us.md b/docs/content/doc/features/authentication.en-us.md
index 21181ac1b2..6a39383846 100644
--- a/docs/content/doc/features/authentication.en-us.md
+++ b/docs/content/doc/features/authentication.en-us.md
@@ -170,6 +170,8 @@ To configure PAM, set the 'PAM Service Name' to a filename in `/etc/pam.d/`. To
work with normal Linux passwords, the user running Gitea must have read access
to `/etc/shadow`.
+**Note**: PAM support is added via [build-time flags](https://docs.gitea.io/en-us/install-from-source/#build), and the official binaries provided do not have this enabled.
+
## SMTP (Simple Mail Transfer Protocol)
This option allows Gitea to log in to an SMTP host as a Gitea user. To