diff --git a/README.md b/README.md
index d55956f..c91561a 100644
--- a/README.md
+++ b/README.md
@@ -34,6 +34,10 @@ recognises the following completed tasks:
 * Selling of organic data (Odyssey only)
 * Vouchers, including bounty vouchers, combat bonds, and settlement vouchers (aka intel packages)
 
+Vouchers help the faction that is listed for them. If said faction is not present in the
+current system, then there is no BGS impact. So the tool looks for all system factions, and
+makes sure that your vouchers actually have a BGS impact, otherwise it won't list them.
+
 Selling cargo attempts to discern the profit and/or loss, which is helpful to gauge BGS
 impact. But the player journal does not tell the amount of profit in the sell message.
 So the tool looks for a buy a message related to the same commodity, and calculates loss