diff --git a/README.md b/README.md
index 6857761..6e721b0 100644
--- a/README.md
+++ b/README.md
@@ -104,6 +104,11 @@ All the parameters mentioned below are **mandatory**, so don't forget to provide
     <td>Port the Rocket.Chat server listens on.</td>
     <td>8006</td>
   </tr>
+  <tr>
+    <td>EXP_ROOMS</td>
+    <td>The private groups and channels names which must be in Rocket.Chat when the tests are running. This parameter is used in combination with the <code>tear_down</code> method that deletes all the extra rooms to provide a clean environment.</td>
+    <td><code>hr,leave-coordination</code></td>
+  </tr>
   <tr>
     <td>USERNAME</td>
     <td>Username of an administrator on the server.</td>