diff --git a/src/suisseid.hxx b/src/suisseid.hxx
index 0131c2b..7c79c00 100644
--- a/src/suisseid.hxx
+++ b/src/suisseid.hxx
@@ -27,6 +27,7 @@
 //@{
 /*! @defgroup suisseidlib SuisseID Library */
 /*! @defgroup suisseidtypes SuisseID C++ Types and Auxiliary */
+/*! @defgroup suisseidconsts SuisseID C++ Constants */
 /*! @defgroup suisseidexceptions SuisseID Exceptions */
 //@}
 
@@ -126,6 +127,13 @@ namespace suisseid {
   /// List of DER encoded binary certificates
   typedef std::vector<Certificate> Certificates;
   //@}
+
+  /*! @addtogroup suisseidconsts */
+  //@{
+      const std::string NON_REP  = "SwissSign_nonRep                ";
+      const std::string DIG_SIG  = "SwissSign_digSig                ";
+      const std::string DATA_ENC = "SwissSign_dataEnc               ";
+  //@}
   
   /*! @addtogroup suisseidlib */
   //@{
@@ -304,10 +312,6 @@ namespace suisseid {
 
     private:
 
-      const std::string NON_REP  = "SwissSign_nonRep                ";
-      const std::string DIG_SIG  = "SwissSign_digSig                ";
-      const std::string DATA_ENC = "SwissSign_dataEnc               ";
-
       std::string _version; // version is cached
       unsigned int _minPinLen; // minimal PIN length is cached
       unsigned int _maxPinLen; // maximal PIN length is cached