diff --git a/doc/source/users/reference_manual/ctlike.rst b/doc/source/users/reference_manual/ctlike.rst
index 95d76d2..82c0f47 100644
--- a/doc/source/users/reference_manual/ctlike.rst
+++ b/doc/source/users/reference_manual/ctlike.rst
@@ -48,12 +48,12 @@ the spatial model parameters can be kept fixed during that computation
 ctlike generates an output model XML file that contains the values of the 
 best fitting model parameters. For all free parameters, an ``error`` attribute
 is added that provides the statistical uncertainty in the parameter estimate.
-In addition, the entire output of the covariance matrix to a separate FITS file
-can be queried (parameter ``outcovmat``). The parameter order given in the file
-corresponds to the arrangement of the covariance matrix entries. If computation
-of the Test Statistics has been requested for a model component, a ``ts``
-attribute providing the Test Statistics value is added. The output model can be
-used as an input model for other ctools.
+In addition, the entire output of the covariance matrix to a separate file in CSV
+format can be queried (parameter ``outcovmat``). The parameter order given in the
+file header corresponds to the arrangement of the covariance matrix entries.
+If computation of the Test Statistics has been requested for a model component,
+a ``ts`` attribute providing the Test Statistics value is added. The output model
+can be used as an input model for other ctools.
 
 
 
@@ -89,7 +89,7 @@ General parameters
     the maximum likelihood fit.
 
 ``(outcovmat = NONE) [string]``
-    Output FITS file to store covariance matrix.
+    Output CSV file to store covariance matrix.
 
 ``(stat = POISSON) [string]``
     Fitting statistics (POISSON or GAUSSIAN; only affects binned analysis).
diff --git a/src/ctlike/ctlike.cpp b/src/ctlike/ctlike.cpp
index 8199bdc..8e796bf 100644
--- a/src/ctlike/ctlike.cpp
+++ b/src/ctlike/ctlike.cpp
@@ -321,7 +321,7 @@ void ctlike::run(void)
 /***********************************************************************//**
  * @brief Save results
  *
- * This method saves the fit results into a XML file and a FITS file. If
+ * This method saves the fit results into a XML file and a CSV file. If
  * the filename parameters are "NONE", the files are not saved.
  ***************************************************************************/
 void ctlike::save(void)
diff --git a/src/ctlike/ctlike.hpp b/src/ctlike/ctlike.hpp
index 3bad996..a769741 100644
--- a/src/ctlike/ctlike.hpp
+++ b/src/ctlike/ctlike.hpp
@@ -70,7 +70,7 @@ protected:
     // User parameters
     bool          m_refit;           //!< Refitting
     GFilename     m_outmodel;        //!< Source model output XML file name
-    GFilename     m_outcovmat;       //!< Covariance matrix output FITS file name
+    GFilename     m_outcovmat;       //!< Covariance matrix output CSV file name
     bool          m_apply_edisp;     //!< Apply energy dispersion?
     bool          m_fix_spat_for_ts; //!< Fix spatial parameters for TS computation?
     GChatter      m_chatter;         //!< Chattiness