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diff --git a/man/pam_systemd.xml b/man/pam_systemd.xml
index d3edc32d2..66d40fca4 100644
--- a/man/pam_systemd.xml
+++ b/man/pam_systemd.xml
@@ -127,7 +127,28 @@
Takes a string
argument which sets the session class.
The XDG_SESSION_CLASS environmental variable
- takes precedence.
+ takes precedence. One of
+ user,
+ greeter,
+ lock-screen or
+ background. See
+ sd_session_get_class3
+ for details about the session class.
+
+
+
+
+
+ Takes a string
+ argument which sets the session type.
+ The XDG_SESSION_TYPE environmental
+ variable takes precedence. One of
+ unspecified,
+ tty,
+ x11 or
+ wayland. See
+ sd_session_get_type3
+ for details about the session type.
@@ -201,6 +222,66 @@
operating system
provides.
+
+
+
+ The following environment variables are read by
+ the module and may be used by the PAM service to pass
+ meta data to the module:
+
+
+
+ $XDG_SESSION_TYPE
+
+ The session type. This
+ may be used instead of
+ on the
+ module parameter line, and is usually
+ preferred.
+
+
+
+ $XDG_SESSION_CLASS
+
+ The session class. This
+ may be used instead of
+ on the
+ module parameter line, and is usually
+ preferred.
+
+
+
+ $XDG_SESSION_DESKTOP
+
+ The session
+ deskop. This may be used to indicate
+ the session desktop used, where this
+ applies. This should be a short,
+ lowercase string identifying the
+ desktop environment used if this
+ information is available. For example:
+ gnome, or
+ kde.
+
+
+
+ $XDG_SEAT
+
+ The seat name the session
+ shall be registered for, if
+ any.
+
+
+
+ $XDG_VTNR
+
+ The VT number the
+ session shall be registered for, if
+ any. (Only applies to seats with a VT
+ available, such as
+ seat0)
+
+