diff --git a/README.md b/README.md
index 1c86bbe..8d3a963 100644
--- a/README.md
+++ b/README.md
@@ -8,10 +8,29 @@ Script that redacts (erases) every message in a room.
 
 #### Get your access token
 
-On [Cinny](https://app.cinny.in) go to Firefox's Inspect tool, to the Storage tab, and copy your `cinny_access_token`. 
-Other apps may have a similar key with this value.
+On [Cinny](https://app.cinny.in), for example, go to Firefox's Inspect tool, to the Storage tab, and copy your `cinny_access_token`. 
+Other clients may have a similar key with this value, which is different for each session and is valid for as long as you don't log out.
 
 ![image](./image.jpg)
 
-Open the `redact_all_messages` script with your favorite text editor and set the value for `homeserver` with the domain of the matrix instance you're logged in, and the `access_token` with the value you just extracted from the browser.
+Open the `redact_all_messages.py` script with your favorite text editor and set the value for `homeserver` with the domain of the matrix instance you're logged in, and the `access_token` with the value you just extracted from the browser.
 
+
+#### Get the Matrix room id
+
+On Cinny you can do this by clicking on the room's name. 
+
+The id will be right below the title of the room, and it looks like this:
+`!cdPNSVToruMtXqGznY:domain.tld`
+
+#### Run the script
+
+```
+python redact_all_messages.py '!cdPNSVToruMtXqGznY:domain.tld'
+```
+
+---
+
+### Note
+
+It will redact (erasing) each of your contacts' comments too, so long as you got permissions over them, which is the case of every private message room.
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