diff --git a/doc/source/reference_manual/ctmodel.rst b/doc/source/reference_manual/ctmodel.rst
index 6976342..0f6f93f 100644
--- a/doc/source/reference_manual/ctmodel.rst
+++ b/doc/source/reference_manual/ctmodel.rst
@@ -18,20 +18,30 @@ General parameters
 ------------------
 
 ``incube [file]``
-    Input counts cube. If the parameter is not NONE or blank, the specified
-    counts cube will be used to define the dimensions of the model cube.
- 	 	 
-``outcube [file]``
-    Output model counts cube.
- 	 	 
+    Input counts cube. If a filename is given the counts cube will be
+    used to define the dimensions of the model cube. The content of
+    the counts cube is not relevant.
+
 ``inmodel [string]``
     Source model XML file.
 
+``outcube [file]``
+    Output model counts cube.
+ 	 	 
 ``(edisp = no) [boolean]``
     Apply energy dispersion to response computation.
 
 ``inobs [file]``
     Input event list, counts cube or observation definition XML file.
+    This information is needed to determine the observation information
+    (number of observations, duration, liftime, pointing, eventually
+    observation specific instrument response functions, etc.).
+
+``expcube = NONE [file]``
+    Exposure cube file (only needed for stacked analysis).
+
+``psfcube = NONE [file]``
+    PSF cube file (only needed for stacked analysis).
 
 ``caldb [string]``
     Calibration database.
diff --git a/src/ctmodel/ctmodel.cpp b/src/ctmodel/ctmodel.cpp
index 2532cba..f902157 100644
--- a/src/ctmodel/ctmodel.cpp
+++ b/src/ctmodel/ctmodel.cpp
@@ -427,14 +427,10 @@ void ctmodel::get_parameters(void)
 
     } // endif: there were no models
 
-    // Read optionally output cube filenames
-    if (read_ahead()) {
-           m_outcube = (*this)["outcube"].filename();
-    }
-
     // Get energy dispersion flag parameters
     m_apply_edisp = (*this)["edisp"].boolean();
 
+    // Optionally get input counts cube for model cube definition
     if (!m_has_cube) {
 
         // Read cube definition file
@@ -467,6 +463,11 @@ void ctmodel::get_parameters(void)
         m_has_cube = true;
     }
 
+    // Read optionally output cube filenames
+    if (read_ahead()) {
+           m_outcube = (*this)["outcube"].filename();
+    }
+
     // Return
     return;
 }
diff --git a/src/ctmodel/ctmodel.hpp b/src/ctmodel/ctmodel.hpp
index 90b8cc4..9bcc51c 100644
--- a/src/ctmodel/ctmodel.hpp
+++ b/src/ctmodel/ctmodel.hpp
@@ -1,7 +1,7 @@
 /***************************************************************************
  *                  ctmodel - Model cube generation tool                   *
  * ----------------------------------------------------------------------- *
- *  copyright (C) 2012-2014 by Juergen Knoedlseder                         *
+ *  copyright (C) 2012-2015 by Juergen Knoedlseder                         *
  * ----------------------------------------------------------------------- *
  *                                                                         *
  *  This program is free software: you can redistribute it and/or modify   *
@@ -34,7 +34,7 @@
 
 /* __Definitions _________________________________________________________ */
 #define CTMODEL_NAME    "ctmodel"
-#define CTMODEL_VERSION "00-04-00"
+#define CTMODEL_VERSION "1.0.0"
 
 
 /***********************************************************************//**
diff --git a/src/ctmodel/ctmodel.par b/src/ctmodel/ctmodel.par
index 3ec7d7c..904ca16 100644
--- a/src/ctmodel/ctmodel.par
+++ b/src/ctmodel/ctmodel.par
@@ -5,7 +5,7 @@
 # ------------------------------------------------------------------------- #
 #                                                                           #
 #  File:      ctmodel.par                                                   #
-#  Version:   00-04-00                                                      #
+#  Version:   1.0.0                                                         #
 #                                                                           #
 #  Author:    Juergen Knoedlseder                                           #
 #             Jurgen.Knodlseder@irap.omp.eu                                 #
@@ -18,14 +18,16 @@
 # General parameters
 #===================
 incube,   f, a, "NONE",,, "Input counts cube"
-outcube,  f, a, "modmap.fits",,, "Output counts cube or observation definition file"
 inmodel,  f, a, "$CTOOLS/share/models/crab.xml",,, "Source model"
+outcube,  f, a, "modcube.fits",,, "Output model cube"
 edisp,    b, h, no,,, "Apply energy dispersion?"
 #
 # Observation parameters
 #=======================
-inobs,    f, a, "NONE",,, "Input event list, cube or observation definition file"
-caldb,    s, a, "$CTOOLS/share/caldb/data/cta/dummy",,, "Calibration database"
+inobs,    f, a, "NONE",,, "Input event list, counts cube or observation definition file"
+expcube,  f, a, NONE,,, "Exposure cube file (only needed for stacked analysis)"
+psfcube,  f, a, NONE,,, "PSF cube file (only needed for stacked analysis)"
+caldb,    s, a, "dummy",,, "Calibration database"
 irf,      s, a, "cta_dummy_irf",,, "Instrument response function"
 ra,       r, a, 83.63,0,360, "RA of pointing (degrees)"
 dec,      r, a, 22.01,-90,90, "Dec of pointing (degrees)"