One way to express a TODO such as this is to use the preprocessor:
```
#if 0 /* TODO: why ... ? */
... /* code you think would make sense */ ...
#else
... /* pre-existing code */ ...
#endif
```
In particular, this would make it easy for someone investigating the matter to simply flip the 0 to a 1 and test the resulting binary.  (Of course, feel free to replace #if 0 with #ifdef on some (presently nowhere-defined) name you think adequately expresses the change you're proposing.)