updated help

nextflow/backmap.nf

@@ -49,7 +49,7 @@ Optional Options: [default]
         --file-separator              STR    Overrides file separator [,]
         --output                      STR    Output directory [./Results/]
                                              Will be created if not existing
-        --prefix                      STR    Prefix of output files
+        --prefix                      STR    Prefix of output files [tbg_backmap]
         --keep-temporary                     Keep temporary, intermediate files [false]
         --threads                     INT    Maximum number of threads per process [1]
                                              This is not the total number of available threads!