diff --git a/README.md b/README.md
index 867bf66..f58f6b4 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ It needs to define an array or tuple `BOOTROM_KEYS` like this:
                 'normalkey': b'',
             },
             # etc.
-            ) * 0x40
+            )
 
 Note that these are *bytes*. You can use [yellows8's boot9 tools](https://github.com/yellows8/boot9_tools) to extract the required keyX for slot 0x3b.