diff --git a/doc/agent-api.txt b/doc/agent-api.txt
index fca2875..9ab2063 100644
--- a/doc/agent-api.txt
+++ b/doc/agent-api.txt
@@ -26,13 +26,7 @@ Methods		void Release()
 			needs to get the passkey for an authentication.
 
 			The return value should be a string of 1-16 characters
-			length. Longer strings are truncated to 16 characters.
-			The string can be alphanumeric.
-
-			Strings starting with '$' are parsed as hex-encoded
-			pins. That is, each two following hex characters form
-			a single byte of the resulting pin. The parser is
-			case-insensitive.
+			length. The string can be alphanumeric.
 
 			Possible errors: org.bluez.Error.Rejected
 			                 org.bluez.Error.Canceled