diff --git a/lib/dencli/cmd.rb b/lib/dencli/cmd.rb
index 1e4bfe1..48aff2c 100644
--- a/lib/dencli/cmd.rb
+++ b/lib/dencli/cmd.rb
@@ -7,6 +7,12 @@ class DenCli::CMD
 	def initialize parent, name, description, exe
 		raise "Proc expected, instead of: #{exe.inspect}"  unless Proc === exe
 		@parent, @name, @description, @exe = parent, name, description, lambda( &exe)
+		@parameters = @exe.parameters
+		@arguments_required = @exe.parameters.select {|e| :req == e[0] }.map {|e| e[1] }
+		@arguments_additional = @exe.parameters.select {|e| :opt == e[0] }.map {|e| e[1] }
+		@arguments = @exe.parameters.select {|e| :req == e[0] or :opt == e[0] }.map {|e| e[1] }
+		@options_required = @exe.parameters.select {|e| :keyreq == e[0] }.map {|e| e[1] }
+		@options_additional = @exe.parameters.select {|e| :key == e[0] }.map {|e| e[1] }
 		@options = {}
 		completion {|*a| [] }
 	end
@@ -14,14 +20,11 @@ class DenCli::CMD
 	def _full_cmd( post) parent._full_cmd [@name]+post end
 	def full_cmd() _full_cmd [] end
 
-	def parameters() @exe.parameters end
-	def arguments_required() @exe.parameters.select {|e| :req == e[0] }.map {|e| e[1] } end
+	attr_reader :parameters,
+		:arguments_required, :arguments_additional, :arguments,
+		:options_required, :options_additional
 	alias required arguments_required
-	def arguments_additional() @exe.parameters.select {|e| :opt == e[0] }.map {|e| e[1] } end
 	alias additional arguments_additional
-	def arguments() @exe.parameters.select {|e| :req == e[0] or :opt == e[0] }.map {|e| e[1] } end
-	def options_required() @exe.parameters.select {|e| :keyreq == e[0] }.map {|e| e[1] } end
-	def options_additional() @exe.parameters.select {|e| :key == e[0] }.map {|e| e[1] } end
 
 	def complete *pre, str
 		@completion.call *pre, str
@@ -54,7 +57,7 @@ class DenCli::CMD
 			end
 			kr = @options.select {|_, o| o.required? and not os.has_key? o.name }
 			unless kr.empty?
-				raise DenCli::UsageError, "Missing argument(s): #{kr.map {|o| o.long || o.short }.join ', '}"
+				raise DenCli::UsageError, "Missing argument(s): #{kr.map {|_, o| o.long || o.short }.join ', '}"
 			end
 		end
 		@exe.call *as, **os