diff --git a/src/GeneralStateTestsFiller/VMTests/vmTests/calldatacopyFiller.yml b/src/GeneralStateTestsFiller/VMTests/vmTests/calldatacopyFiller.yml
index 0090a0538c..f7fc9f8a47 100644
--- a/src/GeneralStateTestsFiller/VMTests/vmTests/calldatacopyFiller.yml
+++ b/src/GeneralStateTestsFiller/VMTests/vmTests/calldatacopyFiller.yml
@@ -145,7 +145,7 @@ calldatacopy:
       # [18] CALLDATACOPY        calldatacopy of 0x0103 bytes to memory 0x1f (and later)
 
       # [20] PUSH1 0x00
-      # [21] MLOAD               ; Should be zero
+      # [21] MLOAD               ; Should load 0 if memory at address 0 is uninitialized
       # [22] DUP1
       # [24] PUSH1 0x60
       # [25] EQ                  ; Is zero equal to 0x60?
@@ -168,7 +168,7 @@ calldatacopy:
       balance: '0x0ba1a9ce0ba1a9ce'
       code: |
         {
-            ; Put a 0x10 byte long value in zero (each byte is two hex digits)
+            ; Put a 0x11 byte long value in zero (each byte is two hex digits)
             ; Then call a contract with just that data. In evm the most
             ; significant byte comes first, so the value ends up in memory
             ; locations 0x10-0x1F
@@ -176,7 +176,7 @@ calldatacopy:
             [0] 0x1234567890abcdef01234567890abcdef0
 
             (call 0xffffff (+ 0x1000 $4) 0
-               0x0F 0x10   ; arg offset and length to get the 0x1234...f0 value
+               0x0F 0x11   ; arg offset and length to get the 0x1234...f0 value
                0x20 0x40)  ; return offset and length
 
             ; Preserve the return data