--- a/tool/Command.h	Mon Jul 28 08:28:42 2008 +0000
+++ b/tool/Command.h	Mon Jul 28 08:45:28 2008 +0000
@@ -85,8 +85,9 @@
     protected:
 		enum {BreakAfterBytes = 16};
 
-        void throwInvalidUsageException(const stringstream &);
-        void throwCommandException(const stringstream &);
+        void throwInvalidUsageException(const stringstream &) const;
+        void throwCommandException(const stringstream &) const;
+        void throwSingleSlaveRequired(unsigned int) const;
 
         typedef list<ec_ioctl_slave_t> SlaveList;
         SlaveList selectedSlaves(MasterDevice &);