diff --git a/Test_Cases/Test_Case1/readme b/Test_Cases/Test_Case1/readme
index d641855..d54d931 100644
--- a/Test_Cases/Test_Case1/readme
+++ b/Test_Cases/Test_Case1/readme
@@ -2,22 +2,28 @@ This folder contains detail for Test_Case1.
 
 The values for the header fields are:
 
-Verison = 4, to indicate IPv4 version is used.
-IHL = 5, which indicates 20 bytes.
-Type of Service = 0,
-Total Window size = 40, which is 28 in hex. The total windows size contains the total lenght of IP header plus data.
-Identification = 0001,
-Flags = All flags are set to zero,
-Fragment Offset = For now, there is no fragment offset so, this value is set to 0.
-
-
-Source IP        = 200.204.10.12, which is c8cc 0a0c in hex
-Destination IP   = 200.204.10.14, which is c8cc 0a0e in hex
-Source Port      = 1234, which is 04D2 in hex,
-Destination Port = 4444, which is 115c in hex.
-
+1. Verison = 4, to indicate IPv4 version is used.
+2. IHL = 5, which indicates 20 bytes.
+3. Type of Service = 0,
+4. Total Window size = 40, which is 28 in hex. The total windows size contains the total lenght of IP header plus data.
+5. Identification = 0001,
+6. Flags = All flags are set to zero,
+7. Fragment Offset = For now, there is no fragment offset so, this value is set to 0.
+8. TTL = 40s, which is 28 in hex.
+9. Protocol = 6, which indicates TCP.
+10. Header Checksum = initially zero and then changed to the sum of 16 bit values of header + data.
+11. Source IP        = 200.204.10.12, which is c8cc 0a0c in hex
+12. Destination IP   = 200.204.10.14, which is c8cc 0a0e in hex
+13. Source Port      = 1234, which is 04D2 in hex,
+14. Destination Port = 4444, which is 115c in hex.
+15. Sequence Number = 0 for now,
+16. Acknowledgement Number = 0,
+17. Flags: 
 For the SYN packet, the SYN Flag in the header has a value of 1.
 For the SYN+ACK packet, the SYN and ACK flags in the header have a value of 1.
 For the ACK packet, the ACK flag in the header has a value of 1.
 For the FIN packet, the FIN flag in the header has a value of 1.
-For the FIN+ACK packet, the FIN and ACK flags in the header have a value of 1.
\ No newline at end of file
+For the FIN+ACK packet, the FIN and ACK flags in the header have a value of 1.
+18. TCP Checksum = initially zero, then:
+(i) Concatenate TCP Pseudo header (Protocol, Source IP, Destination IP, Total Length) with TCP header and TCP data. This creates a big integer.
+(ii) Convert this integer to binary and compute bit wise 1's complement.