diff --git a/README.md b/README.md
index 089c98b..b4a16af 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ A curated list of awesome command-line frameworks, toolkits, guides and gizmos.
 
 * [bash](https://www.gnu.org/software/bash/) - GNU Project's shell (Bourne Again SHell)
 * [elvish](https://elv.sh/) - Friendly, expressive shell features like anonymous functions and data structures
+* [es](https://wryun.github.io/es-shell/) - The extensible shell, based on Plan 9's [rc](https://github.com/rakitzis/rc) shell
 * [fish](https://fishshell.com) - Smart and user-friendly command line shell
 * [ion](https://github.com/redox-os/ion) - A modern system shell that features a simple, yet powerful, syntax. It is written entirely in Rust.
 * [ksh93](https://github.com/att/ast) - Korn Shell