doc: Improve description of extension subtype 5.

diff --git a/doc/dev/system-file-format.texi b/doc/dev/system-file-format.texi
index 4f5aa7edbeb749f39ba0f4b4af000f61a307afdc..ca7c668287634dde3cc9fe5df2b909a593323860 100644 (file)
--- a/doc/dev/system-file-format.texi
+++ b/doc/dev/system-file-format.texi
@@ -1518,7 +1518,8 @@ the following believed meanings:
 
 @table @asis
 @item 5
-A set of grouped variables (according to Aapi H@"am@"al@"ainen).
+A named variable set for use in the GUI (according to Aapi
+H@"am@"al@"ainen).
 
 @item 6
 Date info, probably related to USE (according to Aapi H@"am@"al@"ainen).