diff --git a/content/pages/wiki/duniter/commands.md b/content/pages/wiki/duniter/commands.md
index ba2ab98c25f7997ac95d413094e49ab13e1b0f37..55aedefaf747388ba0733c733e3919d0c35fcc76 100644
--- a/content/pages/wiki/duniter/commands.md
+++ b/content/pages/wiki/duniter/commands.md
@@ -18,6 +18,12 @@ sudo -u duniter <cmd>
 
 Lets you configure the cryptographic keychain used by your node. It is through this trousseau that your node can be identified and its answers authenticated, verified.
 
+Every duniter node has an cryptopraphic keys trousseau, used by sign their transmited information. There are two duniter node types:
+
+1. member nodes: whose keys trousseau match a membre's identity and it get involved in the blocks writting opperation.
+
+2. mirror nodes: when their keys trousseau don't match any member's identity. They can not write any block but they are useful for the network resilence and for answering the client requests.
+
 This keychain consists of a private key and a public key Ed25519.
 
     duniter wizard key