Error in Wiki disassembly book

[why06]

In the chapter on code patterns here: x86 Disassembly/Loop Examples - Wikibooks, collection of open-content textbooks

There are three versions of the disassembly:
1.

push ebp
 mov ebp, esp
 mov esi, [ebp + 8]
 mov ebx, 0
 mov eax, 0
 mov ecx, 0
 _Label_1:
 mov ecx, [esi + ebx * 4]
 add eax, ecx
 inc ebx
 cmp ebx, 100
 jne _Label_1
 mov esp, ebp
 pop ebp
 ret 4

2.

push ebp
 mov ebp, esp
 mov esi, [ebp + 8]
 mov ebx, 0
 mov eax, 0
 mov ecx, 0
 _Label_1:
 mov ecx, [esi + ebx * 4]
 add eax, ecx
 inc ebx
 cmp ebx, 100
 jne _Label_1
 mov esp, ebp
 pop ebp
 ret 4

3.

 push ebp
 mov ebp, esp
 mov esi, [ebp + 8]
 mov ebx, 0
 mov eax, 0
 mov ecx, 0
 _Label_1:
 mov ecx, [esi + ebx * 4]
 add eax, ecx
 add ebx, 4 ;This should not be here
 inc ebx
 cmp ebx, 100
 jne _Label_1
 mov esp, ebp
 pop ebp
 ret 4

The first two are correct, but the last one is wrong. The reason im pointing this out is because in the .pdf version all three example are simply the last two. SO if your using the pdf or even the online wiki keep a look out for errors, and if you come across anything weird, tell me, because it may be wrong as well. Don't be afraid to question books or anything if it looks fishy, even from official sources.