UNET Unofficial Documentation (Errors, Workarounds, Best Practices) ref: http://qiita.com/neon-izm/items/8b98d8fbf590b31c72ef

file0.txt

// for the official things
[SyncListString(hook="MyHook")] SyncListString mylist;
void MyHook(SyncListString.Operation op, int index) {
    // do things
}

// for custom structs
[SyncListString(hook="MyHook")] SyncListStructCustom mylist;
void MyHook(SyncListStructCustom.Operation op, int index) {
    // do things
}