diff --git a/lib/irb/context.rb b/lib/irb/context.rb
index 833e90c2c2..8358bc3a59 100644
--- a/lib/irb/context.rb
+++ b/lib/irb/context.rb
@@ -335,7 +335,7 @@ module IRB
       @inspect_mode
     end
 
-    # Obsolate method.
+    # Obsolete method.
     #
     # Can be set using the +--noreadline+ and +--readline+ command line
     # options.