diff --git a/rfc/0006_ws2p_v2.md b/rfc/0006_ws2p_v2.md
index 317d6d72da13915267aaf3424734c47c1f2c05aa..91f396da43f5d333ad615fcf14925fb45f980272 100644
--- a/rfc/0006_ws2p_v2.md
+++ b/rfc/0006_ws2p_v2.md
@@ -677,22 +677,23 @@ CompactPoolExtCert type description :
 
 ### HEADs v3
 
-| data name          | size in bytes | data type  |
-|:------------------:|---------------|------------|
-| step               | 1             | u8         |
-| software_size      | 1             | u8         |
-| api_outgoing_conf  | 1             | u8         |
-| api_incoming_conf  | 1             | u8         |
-| free_mirror_rooms  | 1             | u8         |
-| low_priority_rooms | 1             | u8         |
-| node_id            | 4             | u32        |
-| pubkey             | 32            | [u8;32]    |
-| blockstamp         | 36            | Blockstamp |
-| software_name      | software_size | utf8       |
-| soft_version       | calculate*    | utf8       |
-| signature          | 64            | [u8;64]    |
-
-_*soft_version_size = head_size - 142 - software_size._
+| data name          | size in bytes     | data type  |
+|:------------------:|-------------------|------------|
+| software_size      | 1                 | u8         |
+| soft_version_size  | 1                 | u8         |
+| step               | 1                 | u8         |
+| api_outgoing_conf  | 1                 | u8         |
+| api_incoming_conf  | 1                 | u8         |
+| free_mirror_rooms  | 1                 | u8         |
+| low_priority_rooms | 1                 | u8         |
+| node_id            | 4                 | u32        |
+| pubkey             | 32                | [u8;32]    |
+| blockstamp         | 36                | Blockstamp |
+| software_name      | software_size     | utf8       |
+| soft_version       | soft_version_size | utf8       |
+| signature          | 64                | [u8;64]    |
+
+_head_size = 142 + soft_version_size + software_size._
 
 software_size := Field size `software_name` in number of bytes.