diff --git a/README.md b/README.md
@@ -40,7 +40,7 @@ Reserved for proprietary use of the card issuer
| Field Separator | one character (generally '^') |
| Expiration date | four characters in the form YYMM. |
| Service code | three characters |
-| Discretionary data | may include Pin Verification Key Indicator (PVKI, 1 character), PIN Verification Value (PVV, 4 characters), Card Verification Value or Card Verification Code (CVV or CVC, 3 characters) |
+| Discretionary data | may include Pin Verification Key Indicator *(PVKI, 1 character)*, PIN Verification Value *(PVV, 4 characters)*, Card Verification Value or Card Verification Code *(CVV or CVC, 3 characters)* |
| End sentine | one character (generally '?') |
| Longitudinal redundancy check (LRC) | it is one character and a validity character calculated from other data on the track |
@@ -57,9 +57,9 @@ This format was developed by the banking industry *(ABA)*. This track is written
| Item | Description |
| ----------------------------------- | ----------- |
-| Start sentinel | one character (generally ';') |
-| Primary account number (PAN) | up to 19 characters. Usually, but not always, matches the credit card number printed on the front of the card. |
-| Separator | one character (generally '=') |
+| Start sentinel | 1 byte *(the ; character)* |
+| Primary account number (PAN) | up to 19 characters *(may contain spaces sometimes)* |
+| Separator | 1 byte *(the = character)* |
| Expiration date | four characters in the form YYMM. |
| Service code | three digits. The first digit specifies the interchange rules, the second specifies authorization processing and the third specifies the range of services |
| Discretionary data | as in track one |
|
