diff --git a/README.md b/README.md
index 479b885..58d76c0 100644
--- a/README.md
+++ b/README.md
@@ -34,7 +34,7 @@ If you prefer an email, contact me at `toolleeo@gmail.com`.
 
 # Summary
 
-* Apps/tools covered: **1158**
+* Apps/tools covered: **1159**
 * Number of categories: **69**.
 
 # Index
@@ -52,7 +52,7 @@ If you prefer an email, contact me at `toolleeo@gmail.com`.
 * [Office tools](#office) (10), [Online search and resources](#online) (14), [Organizers and calendars](#organizers) (20)
 * [Package managers](#package-manager) (9), [Password managers](#password-manager) (16), [Productivity](#productivity) (9), [Programming](#programming) (43), [Prompts](#prompt) (4)
 * [Religion](#religion) (3)
-* [Science](#science) (16), [Screen savers](#screensaver) (4), [Security and encryption](#security) (24), [Shells](#shells) (10), [Sound and music](#music) (36), [System monitoring](#monitor) (41), [System tools](#system) (17)
+* [Science](#science) (16), [Screen savers](#screensaver) (4), [Security and encryption](#security) (24), [Shells](#shells) (10), [Sound and music](#music) (36), [System monitoring](#monitor) (41), [System tools](#system) (18)
 * [Terminals](#terminal) (12), [Text processing](#text-processing) (31), [Text search (alternatives to grep)](#text-search) (10), [Text search and replace (alternatives to sed?)](#text-search-replace) (4), [Time trackers](#time-tracker) (15), [Todo managers](#todo-manager) (26), [Torrent](#torrent) (7), [Typing test and practice](#typing) (7)
 * [Utilities](#utility) (30)
 * [Versioning](#versioning) (6), [Viewers](#viewers) (35)
@@ -1216,6 +1216,7 @@ Music players.
 * [mackup](https://github.com/lra/mackup) - Keep your application settings in sync (OS X/Linux).
 * [Ntfy](https://github.com/dschep/ntfy) - Cross-platform Python utility that enables you to automatically get desktop notifications on demand or when long running commands complete. It can as well send push notifications to your phone once a particular command completes.
 * [pulsemixer](https://github.com/GeorgeFilipkin/pulsemixer) - CLI and curses mixer for PulseAudio.
+* [rs-env](https://github.com/sysid/rs-env) - Hierarchical environment variable management, compiling the resulting set of from a hierarchical list of `<name>.env` files.
 * [Rumos](https://github.com/octagony/rumos) - CLI utility for controlling screen brightness.
 * [sysm](https://github.com/jafarlihi/sysm) - Makes your system play custom sounds when any configured system or external event happens.
 * [systeroid](https://github.com/orhun/systeroid) - A more powerful alternative to sysctl(8) with a terminal user interface.
diff --git a/data/apps.csv b/data/apps.csv
index 2c13747..e75c790 100644
--- a/data/apps.csv
+++ b/data/apps.csv
@@ -1157,3 +1157,4 @@ transfer,newsboat_video_downloader,,https://github.com/Jocomol/newsboat_video_do
 ai,Mods!,,https://github.com/charmbracelet/mods,"AI for the command line, built for pipelines."
 ai,safespace,,https://github.com/danlou/safespace,Your local AI counselor. LLM app that runs offline from a single binary.
 networking,SMBScan,,https://github.com/jeffhacks/smbscan,SMBScan is a tool to enumerate file shares on an internal network.
+system,rs-env,,https://github.com/sysid/rs-env,"Hierarchical environment variable management, compiling the resulting set of from a hierarchical list of `<name>.env` files."