diff -r 56f652ac2d13 -r 0c32d6267b93 lib/Tools/build
--- a/lib/Tools/build	Fri Jul 27 22:28:30 2012 +0200
+++ b/lib/Tools/build	Fri Jul 27 23:14:55 2012 +0200
@@ -26,10 +26,10 @@
   echo "Usage: isabelle $PRG [OPTIONS] [SESSIONS ...]"
   echo
   echo "  Options are:"
-  echo "    -a           include all sessions"
+  echo "    -a           select all sessions"
   echo "    -b           build heap images"
   echo "    -d DIR       include session directory with ROOT file"
-  echo "    -g NAME      include session group NAME"
+  echo "    -g NAME      select session group NAME"
   echo "    -j INT       maximum number of jobs (default 1)"
   echo "    -n           no build -- test dependencies only"
   echo "    -o OPTION    override session configuration OPTION (via NAME=VAL or NAME)"