Add a comment on expectations in the "tar" target
@@ -679,6 +679,8 @@ tags TAGS: FORCE
# Release targets (note: only available on Unix) #####################
+# If your tar command doesn't support --owner and --group, make sure to
+# use one that does, for example GNU tar
TAR_COMMAND=$(TAR) $(TARFLAGS) --owner 0 --group 0 -cvf -
PREPARE_CMD=:
tar:
