diff --git a/bip-0047.mediawiki b/bip-0047.mediawiki
index 31190403..650c0959 100644
--- a/bip-0047.mediawiki
+++ b/bip-0047.mediawiki
@@ -31,9 +31,29 @@ Payment codes add identity information to transactions which is useful in a merc
 
 We define the following 3 levels in BIP32 path:
 
-<pre>
+<code>
 m / purpose' / coin_type' / identity'
-</pre>
+</code>
+
+The child keys derived from an identity are used in different ways:
+
+<code>
+m / purpose' / coin_type' / identity' / 0
+</code>
+
+The 0th (non-hardened) child is the notification key.
+
+<code>
+m / purpose' / coin_type' / identity' / 0 through 2147483647
+</code>
+
+These (non-hardened) keypairs are used for ECDH to generate deposit addresses.
+
+<code>
+m / purpose' / coin_type' / identity' / 0' through 2147483647'
+</code>
+
+These (hardened) keypairs are ephemeral payment codes.
 
 Apostrophe in the path indicates that BIP32 hardened derivation is used.