diff --git a/res/custom-sessions/README b/res/custom-sessions/README
index 23c1ed1..2911923 100644
--- a/res/custom-sessions/README
+++ b/res/custom-sessions/README
@@ -15,8 +15,9 @@ syntax is the same as described in the Freedesktop Desktop Entry Specification.
 The Terminal value specifies if standard output and standard error should be
 redirected to the session log file found in Ly's configuration file. If set to
 true, Ly will consider the program is going to run in a TTY, and thus will not
-redirect standard output & error.
+redirect standard output & error. It is optional and defaults to false.
 
-Finally, do note that the XDG_SESSION_TYPE environment variable is set to
-"unspecified" (without quotes), which is behavior that at least systemd
-recognizes (see pam_systemd's man page)
+Finally, do note that, if the Terminal value is set to true, the
+XDG_SESSION_TYPE environment variable will be set to "tty". Otherwise, it will
+be set to "unspecified" (without quotes), which is behavior that at least
+systemd recognizes (see pam_systemd's man page).