diff --git a/Implementierung/src/helper.c b/Implementierung/src/helper.c
index 7f3f9a4..4ffe475 100644
--- a/Implementierung/src/helper.c
+++ b/Implementierung/src/helper.c
@@ -23,7 +23,15 @@ void help(char *progname) {
   -V, --version <version>      use a specific implementation\n\
   -B, --benchmark [repetitons] benchmark the execution and optionally repeat it\n\
   -T, --test                   run self-test. If set, no file is needed\n\
-  -h, --help                   print this help page\n",
+  -h, --help                   print this help page\n\
+  \n\
+  <version> is an integer between 0 and 4.\n\
+  0: naive implementation\n\
+  1: optimized implementation\n\
+  2: memory efficient implementation\n\
+  3: threaded implementation\n\
+  4: reference implementation\n\
+  \n",
           progname);
 }