diff --git a/twasm/asm/main.asm b/twasm/asm/main.asm
index c858a7a..55e28ae 100644
--- a/twasm/asm/main.asm
+++ b/twasm/asm/main.asm
@@ -817,7 +817,7 @@ tokenise:
     jmp .operand_break_continue
 
   ; cx = token ID
-  .operand_addr_register
+  .operand_addr_register:
     mov word [TOKEN_TABLE_ADDR + rax * TOKEN_TABLE_ENTRY_SIZE], 0x1000
     inc rax ; 0x1000: addr reg token, next token is the register
     mov [TOKEN_TABLE_ADDR + rax * TOKEN_TABLE_ENTRY_SIZE], cx
@@ -1417,12 +1417,12 @@ trim_trailing_whitespace:
   cmp al, 0 ; if last element whitespace
   je .done  ; then break
 
-  .trim     ; otherwise one shorter
+  .trim:    ; otherwise one shorter
     dec rdi
     call trim_trailing_whitespace
     ret
 
-  .done
+  .done:
     mov rax, rdi
     ret
 
@@ -1738,4 +1738,6 @@ program:
   db "hlt", 0x0A ; TODO make it so it doesn't need to end with a newline; this
                  ; would mean range checking members in operator/operand/com-
                  ; ment loops at the end of the program
-  .size db $ - program
+  .size dq $ - program
+
+msg_end db "end of the binary ->|", 0x0A, 0x00
diff --git a/twasm/asm/tests.asm b/twasm/asm/tests.asm
index 9d24b81..23e0178 100644
--- a/twasm/asm/tests.asm
+++ b/twasm/asm/tests.asm
@@ -13,6 +13,8 @@ run_tests:
   mov rsi, .msg
   call print.test
 
+  call test_completeness
+
   call clear_test_arena
   call test_djb2
 
@@ -46,6 +48,27 @@ run_tests:
   ret
   .msg db "running test suite...", 0x0A, 0x00
 
+; ------------------------------------------------------------------------------
+; test_completeness
+;
+; description:
+; visual confirmation of binary integrity
+; ------------------------------------------------------------------------------
+
+test_completeness:
+  mov rsi, .msg
+  call print.test
+  mov rsi, .msg_content
+  call print
+  mov rsi, msg_end
+  call print
+  mov rsi, .msg_confirm
+  call print
+  ret
+  .msg db "test_completeness...", 0x0A, 0x00
+  .msg_content db "  here is the ", 0x00
+  .msg_confirm db "  here is the end of the binary ->|", 0x0A, " assert: the previous 2 lines are identical", 0x0A, 0x00
+
 ; ------------------------------------------------------------------------------
 ; test_elemb
 ;