diff --git a/bin/cdhit_wrapper.R b/bin/cdhit_wrapper.R
index c5f7230..fcbd5eb 100644
--- a/bin/cdhit_wrapper.R
+++ b/bin/cdhit_wrapper.R
@@ -33,7 +33,8 @@ option_list <- list(
 )
 
 opt_parser <- OptionParser(option_list = option_list, 
-                           description = "CD-HIT-EST Wrapper function. See https://github.com/weizhongli/cdhit/wiki for more information regarding CD-HITs parameters.")
+                           description = "CD-HIT-EST Wrapper function. See https://github.com/weizhongli/cdhit/wiki for more information regarding CD-HITs parameters.",
+                           epilogue = "Author: Hendrik Schultheis <Hendrik.Schultheis@mpi-bn.mpg.de>")
 
 opt <- parse_args(opt_parser)
 
@@ -76,7 +77,7 @@ cdhitest <- function(input, identity = 0.8, coverage = 8, output = "cluster.bed"
   }
   
   if (missing(input)) {
-    stop("Input parameter missing!")
+    stop("No input specified! Please forward a valid bed-file.")
   }
   
   message("Loading bed.")