diff --git a/01_hello_world.rb b/src/01_hello_world.rb
similarity index 100%
rename from 01_hello_world.rb
rename to src/01_hello_world.rb
diff --git a/02_user_interface.rb b/src/02_user_interface.rb
similarity index 100%
rename from 02_user_interface.rb
rename to src/02_user_interface.rb
diff --git a/03_fork_02_with_exec_pasted_command.rb b/src/03_fork_02_with_exec_pasted_command.rb
similarity index 100%
rename from 03_fork_02_with_exec_pasted_command.rb
rename to src/03_fork_02_with_exec_pasted_command.rb