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diff --git a/man/pam_systemd.xml b/man/pam_systemd.xml
index d3edc32d2..97cb8bf2d 100644
--- a/man/pam_systemd.xml
+++ b/man/pam_systemd.xml
@@ -127,7 +127,29 @@
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,
+ wayland or
+ mir. See
+ sd_session_get_type3
+ for details about the session type.
@@ -201,6 +223,72 @@
operating system
provides.
+
+
+
+ The following environment variables are read by
+ the module and may be used by the PAM service to pass
+ metadata 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
+
+ A single, short
+ identifier string for the desktop
+ environment. This may be used to
+ indicate the session desktop used,
+ where this applies and if this
+ information is available. For example:
+ GNOME, or
+ KDE. It is
+ recommended to use the same
+ identifiers and capitalization as for
+ $XDG_CURRENT_DESKTOP,
+ as defined by the Desktop
+ Entry
+ Specification.
+
+
+
+ $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)
+
+