diff --git a/USB-protocol.md b/USB-protocol.md
index f73296b..a1e13c4 100644
--- a/USB-protocol.md
+++ b/USB-protocol.md
@@ -252,7 +252,7 @@ Abbreviations/terms used:
 1. Cancel ongoing SC/WFT (`0xf0 0x00`)
 2. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
 3. Send settings (`0xf1`) (passive) (spurious?)
-4. Send settings (`0xf1')
+4. Send settings (`0xf1`)
 5. Send trigger steps (`0xf4`) (optional)
 6. Get status (`0xfd 0x00 0x01 0x02 0xfe`), should return `0x22`.
 7. Cancel ongoing SC/WFT (`0xf0 0x00`)