diff --git a/lib/pry/command_set.rb b/lib/pry/command_set.rb
index 07abd22f..4b022205 100644
--- a/lib/pry/command_set.rb
+++ b/lib/pry/command_set.rb
@@ -125,7 +125,7 @@ class Pry
     # Aliases a command
     # @param [String] new_name New name of the command.
     # @param [String] old_name Old name of the command.
-    # @pasam [String, nil] desc New description of the command.
+    # @param [String, nil] desc New description of the command.
     def alias_command(new_name, old_name, desc = nil)
       commands[new_name] = commands[old_name].dup
       commands[new_name].name = new_name