diff --git a/lib/timeout_interrupt.rb b/lib/timeout_interrupt.rb
index 438783a..4e59b24 100644
--- a/lib/timeout_interrupt.rb
+++ b/lib/timeout_interrupt.rb
@@ -34,7 +34,7 @@ module TimeoutInterruptSingleton
 		# @return [nil]
 		def raise_if_sb_timed_out
 			return  if self.timeouts.empty?
-			key, (at, bt, exception) = self.timeouts.min_by {|key,(at,bt,ex)| at }
+			_key, (at, bt, exception) = self.timeouts.min_by {|_key,(at,_bt,_ex)| at }
 			return  if Time.now < at
 			raise exception, 'execution expired', bt
 		end
@@ -49,7 +49,7 @@ module TimeoutInterruptSingleton
 			else
 				raise_if_sb_timed_out
 				Signal.trap 'ALRM', &method( :alarm_trap)
-				key, (at, bt) = timeouts.min_by {|key,(at,bt)| at }
+				_key, (at, _bt) = timeouts.min_by {|_key,(at,_bt)| at }
 				FFI::LibC.alarm (at - Time.now).to_i + 1
 			end
 			nil
@@ -59,9 +59,9 @@ module TimeoutInterruptSingleton
 		#
 		# @param seconds [0]           No timeout, so block can take any time.
 		# @param seconds [Integer]     In `seconds` Seconds, it should raise a timeout, if not finished.
-		# @param seconds [nil]         If also no block given, everything will be ignored and
-		#                              it will call {setup} for checking and preparing next known timeout.
-		# @param exception [Exception] which will be raised if timed out.
+		# @param seconds [nil]         If this and no block given, it will call {setup} for checking and
+		#                              preparing _next_ known timeout.
+		# @param exception [exception] which exception will be raised if timed out?
 		# @param exception [nil]       `TimeoutInterrupt::Error` will be used to raise.
 		# @param block [Proc]          Will be called and should finish its work before it timed out.
 		# @param block [nil]           Nothing will happen, instead it will return a Proc,
@@ -70,7 +70,8 @@ module TimeoutInterruptSingleton
 		#         Or if not, it will return a Proc, which will expect a Proc if called.
 		#         This Proc has no arguments and will prepare a timeout, like if you had given a block.
 		#
-		# You can rescue `Timeout::Error`, instead `TimeoutInterrupt::Error`, it will work too.
+		# You can rescue `Timeout::Error`, instead `TimeoutInterrupt::Error`,
+		# it is a subclass of `Timeout::Error`.
 		#
 		# It will call your given block, which has `seconds` seconds to end.
 		# If you want to prepare a timeout, which should be used many times,