diff --git a/README b/README
index 18d88d9f..a74829db 100644
--- a/README
+++ b/README
@@ -135,8 +135,8 @@ The process of building a CD is composed of the following steps:
   variables:
 
   - if NONFREE is set, then packages from the components defined in
-    NONFREE_COMPONENTS will be allowed (NONFREE must be exported to
-    all sub-shells)
+    NONFREE_COMPONENTS will be allowed (NONFREE and NONFREE_COMPONENTS
+    must be exported to all sub-shells)
   - if EXTRANONFREE is set, then similarly non-free packages will be
     included on an extra CD (the last CD in fact). Don't use NONFREE
     and EXTRANONFREE at the same time! (EXTRANONFREE must be exported