Index: data/helpdata.txt
===================================================================
--- data/helpdata.txt	(revision 12439)
+++ data/helpdata.txt	(working copy)
@@ -771,6 +771,20 @@
 in the field and supported by that city are also transferred \
 (but not those sitting in other cities).  So make sure the \
 other player isn't getting a better deal than you expect.\
+"), _("\
+     The default diplomatic state between two players is war. However, the \
+first time you meet another AI player, it will offer you a cease-fire. If \
+you accept it, you will enter a period of 16 turns of non-aggression \
+between your two nations. At the end of this period, the other player \
+might offer you an armistice that after another 16 turns will turn into \
+a permanent peace treaty.\
+"), _("\
+     An alliance is the ultimate diplomatic relationship between two \
+players. In this state, an AI player will freely give you its world maps \
+shared vision and let your troops pass through its borders and refuel \
+in its cities. It will also seriously consider trading technologies \
+and cities. The only drawback of an alliance, is that it will draw you \
+into to any wars your ally enters against other players.\
 ")
 
 [help_governor]