diff --git a/doc/format.md b/doc/format.md
index d6da5ac..b580a54 100644
--- a/doc/format.md
+++ b/doc/format.md
@@ -1,7 +1,7 @@
 # FASCIA format
 
 The FASCIA format is a simple JSON format to exchange information from mobile network monitoring devices (such as IMSI catchers, passive analysis tools) into
-a common simple format and to be processed by FASCIA.
+a common simple format and to be processed by FASCIA. The format can be used for GSM, UMTS/WCMDA or LTE networks.
 
 ## Format
 
@@ -9,6 +9,7 @@ a common simple format and to be processed by FASCIA.
 | key  | format | description |
 | ------------- | ------------- | --------- |
 | timestamp     | datetime      | timestamp in UTC when the event was captured           |
+| radiotype     | string        | Network type (such as GSM, UMTS/WCMDA, LTE) |
 | sensor        | string        | a GUID representation of the sensor capturing the event |
 | imsi | string  | IMSI in the following format (270 01 60000000001)          |
 | tmsi1 | string | An hexadecimal representation of the TMSI 1 |
@@ -18,6 +19,7 @@ a common simple format and to be processed by FASCIA.
 | imsi-operator | string | operator (if lookup available) |
 | mcc | integer | mobile country code (MCC) |
 | mnc | integer | mobile network code (MNC) |
-| lac | integer | location area code (LAC) |
-| cell | integer | Cell ID (CID) of the base transceiver stations (BTS) |
+| lac | integer | location area code (LAC) for GSM/UMTS or tracking area code (TAC) for LTE |
+| cell | integer | Cell ID (CID) of the base transceiver stations (BTS) for GSM and LTE. For UTMS, this is the UTRAN cell id with the addition of the radio network controller (RNC).|
+| unit | integer | Primary scrambling code (PSC) for UTMS. Physical cell id (PCI) for LTE. For GSM, the field is empty. |