diff --git a/src/ecopcr.c b/src/ecopcr.c
index f203dd6..f2790db 100644
--- a/src/ecopcr.c
+++ b/src/ecopcr.c
@@ -18,11 +18,18 @@ static void PrintHelp()
         PP      " ecoPCR Version %s\n", VERSION);
         PP      "------------------------------------------\n");
         PP      "synopsis : searching for sequence and taxonomy hybriding with given primers\n");
-        PP      "usage: ecoPCR [options] datafile\n");
+        PP      "usage: ecoPCR [options] <nucleotidic pattern>\n");
         PP      "------------------------------------------\n");
         PP      "options:\n");
-        PP      "-1    : [FIRST] oligonucleotide for direct strand\n\n");
-        PP      "-2    : [SECOND] oligonucleotide for reverse strand\n\n");
+        PP      "-d    : [D]atabase : 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.\n");
+        PP      "        ecoPCRFormat.py creates three file types :");
+        PP      "            .sdx : contains the sequences\n");
+        PP      "            .tdx : contains information concerning the taxonomy\n");
+        PP      "            .rdx : contains the taxonomy rank\n\n");
+        PP      "        ecoPCR needs all the file type. As a result, you have to write the\n");
+        PP      "        database radical without any extension. For example /ecoPCRDB/gbmam\n");        
         PP      "-e    : [E]rror \n");
         PP      "      : max error allowed by oligonucleotide\n\n");
         PP      "-h    : [H]elp - print <this> help\n\n");
@@ -41,15 +48,8 @@ static void PrintHelp()
         PP      "        see its help typing ecofind -h for more information.\n");
         PP      "\n");
         PP      "------------------------------------------\n");
-        PP      "datafile : 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.\n");
-        PP      "ecoPCRFormat.py creates three file types :");
-        PP      "   .sdx : contains the sequences\n");
-        PP      "   .tdx : contains information concerning the taxonomy\n");
-        PP      "   .rdx : contains the taxonomy rank\n\n");
-        PP      "ecoPCR needs all the file type. As a result, you have to write the\n");
-        PP      "datafile radical without any extension. For example /database/gbmam\n");
+        PP      "first argument : oligonucleotide for direct strand\n\n");
+        PP      "second argument : oligonucleotide for reverse strand\n\n");
         PP      "------------------------------------------\n");
         PP      "Table result description : \n");
         PP      "column 1 : accession number\n");
@@ -72,7 +72,7 @@ static void PrintHelp()
         PP      "column 18 : amplification length\n");
         PP      "column 19 : sequence description\n");
         PP      "------------------------------------------\n");
-        PP		" https://www.grenoble.prabi.fr/trac/ecoPCR/wiki");
+        PP		" https://www.grenoble.prabi.fr/trac/ecoPCR/wiki\n");
         PP      "------------------------------------------\n\n");        
         PP      "\n");