diff --git a/lib/irb.rb b/lib/irb.rb
index 5ced3d98a9..48879a57d2 100644
--- a/lib/irb.rb
+++ b/lib/irb.rb
@@ -413,7 +413,7 @@ require_relative "irb/pager"
 #
 # By default, \IRB prefixes a newline to a multiline response.
 #
-# You can change the initial default value by adding to the configuation file:
+# You can change the initial default value by adding to the configuration file:
 #
 #   IRB.conf[:NEWLINE_BEFORE_MULTILINE_OUTPUT] = false
 #