diff --git a/docs/ut61e/serial-protocol.md b/docs/ut61e/serial-protocol.md
index 18c328e..5313d75 100644
--- a/docs/ut61e/serial-protocol.md
+++ b/docs/ut61e/serial-protocol.md
@@ -12,9 +12,9 @@ The information in this document are taken from the [Cyrustek ES51922 datasheet]
 14 frames, including the line ending markers CR and LF.
 
 
-|   0 |     1|     2|     3|     4|     5|       6|     7|      8|      9|     10|     11|12|13|
-|-----|------|------|------|------|------|--------|------|-------|-------|-------|-------|--|--|
-|Range|Digit4|Digit3|Digit2|Digit1|Digit0|Function|Status|Option1|Option2|Option3|Option4|CR|LF|
+|    0  |      1 |      2 |      3 |      4 |      5 |        6 |      7 |       8 |       9 |      10 |      11 | 12 | 13 |
+|-------|--------|--------|--------|--------|--------|----------|--------|---------|---------|---------|---------|----|----|
+| Range | Digit4 | Digit3 | Digit2 | Digit1 | Digit0 | Function | Status | Option1 | Option2 | Option3 | Option4 | CR | LF |
 
 
 ## Fields