Added description of linger mode in the manual.

doc/manual/manual.txt

@@ -336,6 +336,22 @@ and become stronger. They will also die in battle, so you'll need to
 recruit and recall more when that happens. But choose wisely, for each
 has strengths and weaknesses a cunning opponent will quickly exploit.
 
+Victory and Defeat
+^^^^^^^^^^^^^^^^^^
+
+Pay careful attention to the Objectives pop-up box at the beginning of
+each scenario. Usually you will achieve victory by killing all enemy
+leaders, and only be defeated by having your leader killed. But
+scenarios may have other victory objectives - getting your leader to a
+designated point, say, or escuing someone, or solving a puzzle, or
+holding out against a siege until a certain number of terms have
+elapsed.
+
+When you win a scenario, the map will gray over and the 'End Turn'
+button will change to 'End Scenario'.  You can now do things like
+changing yourc save options or (if you are in a multiplayer game)
+chatting with other players before pressing that button to advance.
+
 Money
 ^^^^^