diff --git a/README.md b/README.md
index 34407c25..a77671c1 100644
--- a/README.md
+++ b/README.md
@@ -33,8 +33,8 @@ Windows:
 Setup
 --------
 The first time that you run the app you are prompted for your username and password. This is the same username and password
-combination that you use to log into the Elite: Dangerous launcher. You can also choose here whether to send the market
-data that you download to EDDN, or to save it locally.
+combination that you use to log into the Elite: Dangerous launcher, and is required so that the Frontier servers can send the app the market data for the station that *you* are docked at.
+You can also choose here whether to send the market data that you download to EDDN, or to save it locally.
 
 You are next prompted to authenticate with a "verification code", which you will shortly receive by email from Frontier.
 Note that each "verification code" is one-time only - if you enter the code incorrectly or quit the app before