diff --git a/LICENSE.md b/LICENSE.md
index 8ec8ab5..efd955f 100644
--- a/LICENSE.md
+++ b/LICENSE.md
@@ -1,3 +1,4 @@
+Copyright (c) 2009-2017 Robby Russell and contributors (https://github.com/ohmyzsh/ohmyzsh/contributors)
 Copyright 2017-2020 Toan Nguyen and contributors (https://github.com/ohmybash/oh-my-bash/graphs/contributors)
 
 Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
diff --git a/README.md b/README.md
index 469bf49..fb1e242 100644
--- a/README.md
+++ b/README.md
@@ -198,4 +198,5 @@ Thank you so much!
 
 ## License
 
+Oh My Bash is derived from [Oh My Zsh](https://github.com/ohmyzsh/ohmyzsh).
 Oh My Bash is released under the [MIT license](LICENSE.md).