diff --git a/lib/robustserver.rb b/lib/robustserver.rb
index 7162a5c..ce1e968 100644
--- a/lib/robustserver.rb
+++ b/lib/robustserver.rb
@@ -4,6 +4,7 @@ def Signal.signame s
 	when String then s
 	when Symbol then s.to_s
 	when Fixnum then list.invert[s]
+	else raise ArgumentError, "String, Symbol or Fixnum expected, not #{s.class}"
 	end                            
 end                                    
 
@@ -12,6 +13,7 @@ def Signal.sig s
 	when Fixnum then s
 	when String then list[s]
 	when Symbol then list[s.to_s]
+	else raise ArgumentError, "String, Symbol or Fixnum expected, not #{s.class}"
 	end                          
 end                                  
 
@@ -25,25 +27,58 @@ def Signal.[] s
 	when String then list[s]
 	when Symbol then list[s.to_s]
 	when Fixnum then list.invert[s]
-	else raise ArgumentError       
+	else raise ArgumentError, "String, Symbol or Fixnum expected, not #{s.class}"
 	end                            
 end                                    
 
+# Counts retries ot something.  If the retries are to often in a short time,
+# you shouldn't retry again.
+#
+# Example:
+# retries = Retry.new 5, 1
+# begin
+# 	array_of_ints_and_some_strings.each do |i|
+#			puts 2*i
+# 	end
+# rescue TypeError
+# 	retries.retry? and retry
+# 	raise $!
+# end
+#
+# Retry.new( 10, 30).run( ConnectionLost) do
+# 	try_to_connect_to_db
+# 	try_query
+# end
 class Retries
 	attr_accessor :max, :range
 	attr_reader :count, :last
 
+	# max: How many retries in range-time are allowed maximal.
+	# range: In which time-range are these retries are allowed
 	def initialize max = nil, range = nil
 		@max, @range, @count, @last = max || 10, range || 10, 0, Time.now
 	end
 
+	# Counts retries on every call.
+	# If these retries are to often - max times in range - it will return false
+	# else true.
+	# Now you can say: "I give up, to many retries, it seems it doesn't work."
 	def retry?
 		@count = @last + @range > Time.now ? @count + 1 : 1
 		@last = Time.now
 		@count < @max
 	end
 
-	def run ex, &e
+	# Automatical retrieing on raised exceptions in block.
+	# ex: Your expected Esception you will rescue. Default: Object, so realy everything.
+	#
+	# Example:
+	# Retries.new( 10, 30).run ArgumentError do something_do_which_could_raise_exception ArgumentError end
+	#
+	# This will retry maximal 10 times in 30 seconds to Call this block. But only rescues ArgumentError!
+	# Every other Error it will ignore and throws Exception. No retry.
+	def run ex = nil, &e
+		ex ||= Object
 		begin e.call *args
 		rescue ex
 			retries.retry? and retry
@@ -51,6 +86,16 @@ class Retries
 	end
 end
 
+# Easy problem-handler for your Server.
+# 
+# A Server should never crash.
+# If an Exception raised, which is not rescued,  your program will shutdown abnormaly.
+# Or if a signal tries to "kill" your program,  your program will shutdown abnormaly too.
+# 
+# With RobustServer these errors will be a more unimportant problem and  It'll be easier to handle.
+# 
+# Subclasses should implements *#run*,  which will be your main-worker.
+# For initializing,  you can override **#initialize**,  but doen't forget to call **super**.
 class RobustServer
 	attr_reader :signals