diff --git a/README.md b/README.md
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--- a/README.md
+++ b/README.md
@@ -1,3 +1,51 @@
 # tootpaste
 
-Toot(h)paste is a simple bash script to clean your Mastodon instance.
\ No newline at end of file
+Toot(h)paste is a simple bash script to clean your Mastodon instance.
+
+# How to install
+
+```bash
+$ wget https://git.benpro.fr/benoit/tootpaste/raw/branch/main/tootpaste.sh \
+  -O /tmp/tootpaste.sh
+$ sudo install -m 755 -o root -g root /tmp/tootpaste.sh /usr/local/bin/tootpaste
+```
+
+# How to use
+
+By default it runs in dry-run mode.
+To run without dry-run:
+
+```bash
+$ DRY_RUN=false tootpaste
+```
+
+## Parameters
+
+There are no arguments, everything is managed by environment variables, here is 
+the list of what you can use:
+
+- `DO_ACCOUNTS_CULL`, boolean, run or not accounts cull step, default: `true`
+- `DO_MEDIA_REMOVE`, boolean, run or not media remove step, default: `true`
+- `DO_STATUSES_REMOVE`, boolean, run or not statuses remove step, default: 
+`true`
+- `DO_CACHE_RECOUNT`, boolean, run or not cache recount step, default: `true`
+- `TOOTCTL`, string, path to tootctl binary, default: 
+`/home/mastodon/live/bin/tootctl`
+- `DB_POOL`, integer, concurrency to use (connections to PostgreSQL), default: 
+- `DRY_RUN`, boolean, run or not in dry-run mode, default: `true`
+- `TLS_EXPIRED_MAX_SEC`, integer, number of seconds, age difference between now 
+and date of expired certificate, default: `1210000`, 2w
+- `INSTANCE_LAST_CHANCE_TIMEOUT`, integer, timeout in seconds to connect to an 
+instance that was previously not accessible, default: `30`
+- `MEDIA_REMOVE_DAYS`, integer, how old in days media attachments have to be 
+before getting removed
+- `CARDS_REMOVE_DAYS`, integer, how old in days cards previews have to be 
+before getting removed
+- `STATUSES_REMOVE_DAYS`, integer, how old in days unreferenced statuses have 
+to be before getting removed
+
+Example:
+
+```bash
+$ DRY_RUN=false DO_CACHE_RECOUNT=false DB_POOL=50 tootpaste
+```