diff --git a/src/ecoisundertaxon.c b/src/ecoisundertaxon.c
index 21aac91..8fd3a07 100644
--- a/src/ecoisundertaxon.c
+++ b/src/ecoisundertaxon.c
@@ -1,14 +1,78 @@
 #include "libecoPCR/ecoPCR.h"
 #include <getopt.h>
+#include <stdlib.h>
+
+#define VERSION "0.1"
+
+/* ----------------------------------------------- */
+/* printout verbose mode                           */                                           
+/* ----------------------------------------------- */
+static void printTaxon(ecotx_t *taxon){
+	printf("# taxid : %d | rank : %d | name : %s \n\n",taxon->taxid, taxon->rank, taxon->name);
+}
+
+/* ----------------------------------------------- */
+/* printout help                                   */                                           
+/* ----------------------------------------------- */
+#define PP fprintf(stdout, 
+
+static void PrintHelp()
+{
+        PP      "\n------------------------------------------\n");
+        PP      " ecoisundertaxon Version %s\n", VERSION);
+        PP      "------------------------------------------\n");
+        PP      " synopsis : searching relationship in taxonomy\n");
+        PP      " usage: ecoisundertaxon [options] database\n");
+        PP      "------------------------------------------\n");
+        PP      " options:\n");
+        PP      " -1    : [FIRST] taxomic id of the hypothetical son\n\n");
+        PP      " -2    : [SECOND] taxonomic id of the hypothetical parent\n\n");
+        PP      " -v    : [V]erbose mode. Display taxonomic information for both\n");
+        PP      "       : taxonomic id.\n\n");
+        PP      " -h    : [H]elp - print <this> help\n\n");
+        PP      "------------------------------------------\n");
+        PP      " database : to match the expected format, the database\n");
+        PP      " has to be formated first by the ecoPCRFormat.py program located.\n");
+        PP      " in the tools directory. Type the radical only, leaving out the extension\n");
+        PP      "------------------------------------------\n\n");
+}
+
+#undef PP
+
+/* ----------------------------------------------- */
+/* printout usage and exit                         */
+/* ----------------------------------------------- */
+
+#define PP fprintf(stderr, 
+
+static void ExitUsage(stat)
+        int stat;
+{
+        PP      "usage: ecoisundertaxon [-1 taxid] [-2 taxid] [-v] [-h] datafile\n");
+        PP      "type \"ecoisundertaxon -h\" for help\n");
+
+        if (stat)
+            exit(stat);
+}
+
+#undef  PP
+
+/* ----------------------------------------------- */
+/* MAIN						                       */
+/* ----------------------------------------------- */
 
 int main(int argc, char **argv){
 	int32_t     	carg 		= 0;
 	int32_t			taxid_1		= 0;
 	int32_t			taxid_2		= 0;
+	int32_t			verbose		= 0;
+	int32_t			errflag		= 0;
 	ecotaxonomy_t 	*taxonomy	= NULL;
-	ecotx_t			*son		= NULL;	
+	ecotx_t			*son		= NULL;
+	ecotx_t			*parent		= NULL;
+		
 	
-	while ((carg = getopt(argc, argv, "1:2:")) != -1) {
+	while ((carg = getopt(argc, argv, "1:2:vh")) != -1) {
 	    switch (carg) {                              
 	        case '1':
 	           sscanf(optarg,"%d",&taxid_1);
@@ -17,13 +81,37 @@ int main(int argc, char **argv){
 	        case '2':     
 	           sscanf(optarg,"%d",&taxid_2);
 	           break;
+	           
+	        case 'v':     
+	           verbose = 1;
+	           break;
+	           
+	        case 'h':     
+	           PrintHelp();
+           	   exit(0);
+	           break;
+	           
+	        case '?':
+            	errflag++;
 	     }
 	}
-		
+	
+	if ((argc -= optind) != 1)
+    	errflag++;
+    	
+    if (errflag)
+    	ExitUsage(errflag);
+  		
 	taxonomy = read_taxonomy(argv[optind]);
 	
 	son = eco_findtaxonbytaxid(taxonomy, taxid_1);
 	
+	if (verbose){
+		parent = eco_findtaxonbytaxid(taxonomy, taxid_2);
+		printTaxon(son);
+		printTaxon(parent);
+	}
+	
 	if (eco_isundertaxon(son, taxid_2))
 		printf("# taxid_1 (%d) is son of taxid_2 (%d)\n",taxid_1, taxid_2);
 	else