diff --git a/doc/xschem_man/graphs.html b/doc/xschem_man/graphs.html
index 940e6975..ef5d9136 100644
--- a/doc/xschem_man/graphs.html
+++ b/doc/xschem_man/graphs.html
@@ -276,7 +276,8 @@ The following syntax:
   <kbd>"alias_name; signal_name % dataset# raw_file sim_type</kbd><br>
    where:<br>
    <kbd>dataset#</kbd> is the dataset index to display (only meaningful and needed
-   if multiple datasets are present like in Montecarloo / Mismatch simulations).<br>
+   if multiple datasets are present like in Montecarloo / Mismatch simulations).
+   If empty or -1 then show all datasets.<br>
    <kbd>raw_file</kbd> is the location and name of the raw file to load. You can use 
    <kbd>$netlist_dir</kbd> to quickly reference the simulation directory where usually such
    raw files are located.<br>