diff --git a/README.md b/README.md
index 8a0b19d..7b7dbf2 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,7 @@ function display_ip_hdr(iphdr::IpHdr)
     println("  |- Protocol        : $(iphdr.protocol)")
     println("  |- Src Ip          : $(iphdr.src_ip)")
     println("  |- Dest Ip         : $(iphdr.dest_ip)")
-    println("  |- Checksum        : 0x$(hex(iphdr.checksum,4))")
+    println("  |- Checksum        : $(iphdr.checksum)")
 end # function display_ip_hdr
 
 function display_udp_hdr(udphdr::UdpHdr)
@@ -30,7 +30,7 @@ function display_udp_hdr(udphdr::UdpHdr)
     println("  |- Src Port  : $(udphdr.src_port)")
     println("  |- Dest Port : $(udphdr.dest_port)")
     println("  |- Length    : $(udphdr.length)")
-    println("  |- Checksum  : 0x$(hex(udphdr.checksum, 4))")
+    println("  |- Checksum  : 0x$(string(udphdr.checksum, base = 16, pad = 4))")
     print("  |- Data : ")
 
     n = 0
@@ -38,7 +38,7 @@ function display_udp_hdr(udphdr::UdpHdr)
         if n % 16 == 0 && n != 0
             print("\n            ")
         end
-        print("$(hex(byte, 2)) ")
+        print("$(string(byte, base = 16, pad = 2)) ")
         n = n + 1
     end
 end # function display_udp_hdr
@@ -74,7 +74,7 @@ IP Header
   |- Protocol        : 17
   |- Src Ip          : 192.168.0.51
   |- Dest Ip         : 192.168.0.1
-  |- Checksum        : 0x67ca
+  |- Checksum        : true
 UDP Header
   |- Src Port  : 34904
   |- Dest Port : 53