vidjil.cpp: clarify help on -z and -A

algo/vidjil.cpp

@@ -183,8 +183,11 @@ void usage(char *progname)
        << "Limits to report a clone" << endl
        << "  -R <nb>       minimal number of reads supporting a clone (default: " << MIN_READS_CLONE << ")" << endl
        << "  -% <ratio>    minimal percentage of reads supporting a clone (default: " << RATIO_READS_CLONE << ")" << endl
-       << "  -z <nb>       maximal number of clones reported (0: no limit) (default: " << MAX_CLONES << ")" << endl
-       << "  -A            reports all clones (-r 0 -R 1 -% 0 -z 0), to be used only on very small datasets" << endl
+       << endl
+
+       << "Limits to segment a clone" << endl
+       << "  -z <nb>       maximal number of clones to be segmented (0: no limit, do not use) (default: " << MAX_CLONES << ")" << endl
+       << "  -A            reports and segments all clones (-r 0 -R 1 -% 0 -z 0), to be used only on very small datasets" << endl
        << endl
 
        << "Fine segmentation options (second pass, see warning in doc/README)" << endl