related to #115

doc/kmc_tools/transform.tex

@@ -41,6 +41,12 @@ \section{transform}
 
 If these parameters are not specified they are deduced based on input database. \\
 
+For \textsf{histogram} operation additional \textsf{output\_params} are available:
+\begin{itemize}
+	\item \textsf{-ci<vaule>} --- minimum value of a counter to be stored in the output file (default value is a cutoff min stored in the database),
+	\item \textsf{-cx<value>} --- maximum value of a counter to be stored in the output file (default value is a minimum of tree: $10^4$, cutoff max stored in the database, $2^{8\mathrm{CS}}-1$, where CS is the number of bytes used to store counters in the database)
+\end{itemize}
+
 For dump operation there are additional \textsf{oper\_params}:
 \begin{itemize}
 	\item \textsf{-s} --- force sorted output (default: false). \\

kmc_tools/config.h

@@ -396,7 +396,11 @@ class CTransformOperationUsageDisplayer : public CUsageDisplayer
 				  << "  -ci<value> - exclude k-mers occurring less than <value> times \n"
 				  << "  -cx<value> - exclude k-mers occurring more of than <value> times\n"
 				  << "  -cs<value> - maximal value of a counter\n"
-
+
+				  << " For histogram operation there are additional output_params:\n"
+				  << "  -ci<value> - minimum value of counter to be stored in the otput file\n"
+				  << "  -cx<value> - maximum value of counter to be stored in the otput file\n"
+
 				  << " For dump operation there are additional oper_params:\n"
 				  << "  -s - sorted output\n"
 				  << "Example:\n"