diff --git a/twasm/README.md b/twasm/README.md
index aed9ea1..a0a1c39 100644
--- a/twasm/README.md
+++ b/twasm/README.md
@@ -316,14 +316,14 @@ supported tokens are listed below
 
 | token | id     | notes |
 |-------|--------|-|
-| rax   | 0x0000 | |
-| rbx   | 0x0001 | |
-| rcx   | 0x0002 | |
-| rdx   | 0x0003 | |
-| rsi   | 0x0004 | |
-| rdi   | 0x0005 | |
-| rsp   | 0x0006 | |
-| rbp   | 0x0007 | |
+| rax   | 0x0000 | register |
+| rbx   | 0x0001 | register |
+| rcx   | 0x0002 | register |
+| rdx   | 0x0003 | register |
+| rsi   | 0x0004 | register |
+| rdi   | 0x0005 | register |
+| rsp   | 0x0006 | register |
+| rbp   | 0x0007 | register |
 | r8    | 0x0008 | unimplemented |
 | r9    | 0x0009 | unimplemented |
 | r10   | 0x000A | unimplemented |
@@ -332,14 +332,14 @@ supported tokens are listed below
 | r13   | 0x000D | unimplemented |
 | r14   | 0x000E | unimplemented |
 | r15   | 0x000F | unimplemented |
-| eax   | 0x0010 | |
-| ebx   | 0x0011 | |
-| ecx   | 0x0012 | |
-| edx   | 0x0013 | |
-| esi   | 0x0014 | |
-| edi   | 0x0015 | |
-| esp   | 0x0016 | |
-| ebp   | 0x0017 | |
+| eax   | 0x0010 | register |
+| ebx   | 0x0011 | register |
+| ecx   | 0x0012 | register |
+| edx   | 0x0013 | register |
+| esi   | 0x0014 | register |
+| edi   | 0x0015 | register |
+| esp   | 0x0016 | register |
+| ebp   | 0x0017 | register |
 | r8d   | 0x0018 | unimplemented |
 | r9d   | 0x0019 | unimplemented |
 | r10d  | 0x001A | unimplemented |
@@ -348,14 +348,14 @@ supported tokens are listed below
 | r13d  | 0x001D | unimplemented |
 | r14d  | 0x001E | unimplemented |
 | r15d  | 0x001F | unimplemented |
-| ax    | 0x0020 | |
-| bx    | 0x0021 | |
-| cx    | 0x0022 | |
-| dx    | 0x0023 | |
-| si    | 0x0024 | |
-| di    | 0x0025 | |
-| sp    | 0x0026 | |
-| bp    | 0x0027 | |
+| ax    | 0x0020 | register |
+| bx    | 0x0021 | register |
+| cx    | 0x0022 | register |
+| dx    | 0x0023 | register |
+| si    | 0x0024 | register |
+| di    | 0x0025 | register |
+| sp    | 0x0026 | register |
+| bp    | 0x0027 | register |
 | r8w   | 0x0028 | unimplemented |
 | r9w   | 0x0029 | unimplemented |
 | r10w  | 0x002A | unimplemented |
@@ -364,14 +364,14 @@ supported tokens are listed below
 | r13w  | 0x002D | unimplemented |
 | r14w  | 0x002E | unimplemented |
 | r15w  | 0x002F | unimplemented |
-| al    | 0x0030 | |
-| bl    | 0x0031 | |
-| cl    | 0x0032 | |
-| dl    | 0x0033 | |
-| sil   | 0x0034 | |
-| dil   | 0x0035 | |
-| spl   | 0x0036 | |
-| bpl   | 0x0037 | |
+| al    | 0x0030 | register |
+| bl    | 0x0031 | register |
+| cl    | 0x0032 | register |
+| dl    | 0x0033 | register |
+| sil   | 0x0034 | register |
+| dil   | 0x0035 | register |
+| spl   | 0x0036 | register |
+| bpl   | 0x0037 | register |
 | r8b   | 0x0038 | unimplemented |
 | r9b   | 0x0039 | unimplemented |
 | r10b  | 0x003A | unimplemented |
@@ -395,25 +395,25 @@ supported tokens are listed below
 | cr3   | 0x004C | unimplemented |
 | cr4   | 0x004D | unimplemented |
 | cr8   | 0x004E | unimplemented |
-| hlt   | 0x004F | |
-| int3  | 0x0050 | |
+| hlt   | 0x004F | operator |
+| int3  | 0x0050 | operator |
 |       | 0x0051 | deprecated; formerly `[`. Now `0x10XX` is used. |
 |       | 0x0052 | deprecated; formerly `]`. |
-| xor   | 0x0053 | |
-| inc   | 0x0054 | |
-| dec   | 0x0055 | |
-| mov   | 0x0056 | |
-| add   | 0x0057 | |
-| sub   | 0x0058 | |
-| call  | 0x0059 | |
-| ret   | 0x005A | |
-| cmp   | 0x005B | |
-| jmp   | 0x005C | |
-| je    | 0x005D | |
-| jne   | 0x005E | |
-| push  | 0x005F | |
-| pop   | 0x0060 | |
-| out   | 0x0061 | |
+| xor   | 0x0053 | operator |
+| inc   | 0x0054 | operator |
+| dec   | 0x0055 | operator |
+| mov   | 0x0056 | operator |
+| add   | 0x0057 | operator |
+| sub   | 0x0058 | operator |
+| call  | 0x0059 | operator |
+| ret   | 0x005A | operator |
+| cmp   | 0x005B | operator |
+| jmp   | 0x005C | operator |
+| je    | 0x005D | operator |
+| jne   | 0x005E | operator |
+| push  | 0x005F | operator |
+| pop   | 0x0060 | operator |
+| out   | 0x0061 | operator |
 | db    | 0x0100 | pseudo-operator |
 |       | 0x10XX | some memory address; `XX` is as specified below |
 |       | 0x20XX | some constant; `XX` is as specified below |