diff --git a/tool/dsviewer/dsviewer.md b/tool/dsviewer/dsviewer.md
index c43636d..7f25865 100644
--- a/tool/dsviewer/dsviewer.md
+++ b/tool/dsviewer/dsviewer.md
@@ -5,9 +5,9 @@ Does what it says.
 Show the table information.
 
 #### open \<file\> [hashead|nohead] [\<delimeter\>] [\<tag-sym\>] [\<att-sym\>]
-Open a dsv/csv file
+Open a dsv/csv file. The default setups are 'nohead', space for delimeter, '#' for annotations, and '!' for tags.
 
-#### save
+#### save \<file\>
 Save table to a dsv/csv file
 
 #### stats \<column\> \<column\>...