diff --git a/Brewfile b/Brewfile
index f519b58..d4edc78 100644
--- a/Brewfile
+++ b/Brewfile
@@ -68,6 +68,7 @@ brew "stow" # Symlink farm manager
 brew "tealdeer" # Fast tldr client written in Rust
 brew "tmux" # Terminal multiplexer
 brew "zellij" # Modern terminal workspace with layouts and plugins
+brew "herdr" # Agent multiplexer that lives in your terminal
 brew "tokei" # Count code, quickly
 brew "turso" # Edge SQLite database CLI
 brew "watchman" # Watch files and record when they change
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 740d198..bf62b23 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   - The `docker` formula already installed via Brewfile provides the CLI (and its completions), so no replacement package is needed
 
 ### Added
+- Herdr agent multiplexer to Brewfile and documentation (#113)
+  - Added `brew "herdr"` to Brewfile, alongside Tmux and Zellij
+  - Documented Herdr under the Terminal Multiplexers section in README.md
+
 - rtk-ai token optimization proxy and gh-stack CLI tools (#114)
   - Added `brew "rtk"` to Brewfile
   - Created `scripts/setup-rtk.sh` to install rtk and wire it into Claude Code, Codex, and OpenCode globally
diff --git a/README.md b/README.md
index 3b71183..9f1a357 100644
--- a/README.md
+++ b/README.md
@@ -307,6 +307,7 @@ The dotfiles now include comprehensive terminal setup tools for an enhanced deve
 #### Terminal Multiplexers
 - **Tmux**: Terminal multiplexer for managing multiple sessions
 - **Zellij**: Modern terminal workspace with built-in layouts and plugins
+- **Herdr**: Agent multiplexer that keeps coding agent sessions alive in your terminal ([herdr.dev](https://herdr.dev/docs/install/))
 
 #### Shell Enhancements
 - **Starship**: Cross-shell prompt customization with minimal, blazing-fast design