diff --git a/pynxtools/dataconverter/README.md b/pynxtools/dataconverter/README.md
index 7179eb594..7816ff435 100644
--- a/pynxtools/dataconverter/README.md
+++ b/pynxtools/dataconverter/README.md
@@ -27,7 +27,8 @@ Options:
                                   arguments instead. The path to the input
                                   data file to read. (Repeat for more than one
                                   file.)
-  --reader [example]              The reader to use. default="example"
+  --reader [example|json_map|json_yml]
+                                  The reader to use. default="example"
   --nxdl TEXT                     The name of the NXDL file to use without
                                   extension.This option is required if no '--
                                   params-file' is supplied.