diff --git a/error_codes.md b/error_codes.md
index 1f7983e..af78741 100644
--- a/error_codes.md
+++ b/error_codes.md
@@ -9,6 +9,7 @@
 | 11005 | Unit in request is not supported                | [NUT-04][04], [NUT-05][05]               |
 | 11006 | Amount outside of limit range                   | [NUT-04][04], [NUT-05][05]               |
 | 11007 | Amountless invoice is not supported             | [NUT-05][05]                             |
+| 11008 | Amount in request does not equal invoice        | [NUT-05][05]                             |
 | 12001 | Keyset is not known                             | [NUT-02][02], [NUT-04][04]               |
 | 12002 | Keyset is inactive, cannot sign messages        | [NUT-02][02], [NUT-03][03], [NUT-04][04] |
 | 20001 | Quote request is not paid                       | [NUT-04][04]                             |