diff --git a/README.md b/README.md
index de038f1..04932ae 100644
--- a/README.md
+++ b/README.md
@@ -8,27 +8,29 @@ This script relies mainly on `dmenu` for interactions.
 threadwatcher [add URL DL_LOCATION] [list] [edit] [clean]
 
 add URL DL_LOCATION
-        downloads specified thread to given locaton. Paths can be relative to HOME or absolute.
-list
-        lists all currently watched URLs and where they are downloading to
-edit
-        open threads file in $EDITOR/vim to manually edit error
-clean
-        deletes threads file. This will not delete already downloaded material.
+	downloads specified thread to given location. Paths can be relative to \$HOME or absolute.
+list	lists all currently watched URLs and where they are downloading to
+edit	open threads file in \$EDITOR/vim to manually edit.
+clean	deletes threads file. This will not delete already downloaded material.
+prune	manually prune list of threads. Deletes all finished threads from list.
+dedupe	[DIR]
+	remove all duplicate files from current download directories. (Comparing sha512 sums)
+	If no DIR is given, will check all currently downloading directories.
+help	display this help and exit.
 ```
 
 ## Installation
 
 ### AUR
 threadwatcher is in the AUR! Using your favorite AUR package manager, paru for example, it's a simple
-```
+```sh
 paru -S threadwatcher
 ```
 This is the recommended installation version for Arch-based distros.
 
 ### From Source
 As the Makefile might suggest, it's
-```
+```sh
 git clone https://github.com/AlexBocken/threadwatcher
 cd threadwatcher
 make install
@@ -36,12 +38,18 @@ make install
 root privileges are required for the default install location.
 If issues with running the program persist, first check the "Requirements" section below.
 
+## Environment variables
+There are some environment variables which can be set to change threadwatchers behaviour:
+
+| variable name          | explanation                                                                                                                      | default                                              |
+| `TW_THREADWATCHER_DIR` | sets location of file with list of threads                                                                                       | `${XDG_DATA_HOME:-$HOME/.local/share}/threadwatcher` |
+| `TW_AUTOPRUNE`         | delete threads out of list if nothing can be found on scan. (Can result in wrong behaviour with unreliable internet connections) | `true`                                               |
+| `TW_AUTODEDUPE`        | remove duplicates automatically after each scan. (Using sha521 sums)                                                             | `false`                                              |
 
 ## Requirements
-Besides the obvious stuff for shell scripts like `sed`,`awk`,`grep` and other base-devel programs, this script relies on `jq` and, of course, `dmenu`.
+Besides the obvious stuff for shell scripts like `sed`,`awk`,`grep` and other base-devel programs, this script relies on `jq` and, of course, `dmenu` (now only optionally relies on dmenu).
 Make sure these programs are installed.
 
-
 ## TODO
 
 [ ] differentiate between thread complete and 4chan down (curl error codes don't work because of cloudflare)