|Good for you - sort of. :-)|
Typically, when using VLOOKUP, Absolute referencing is used for both the Row number and the Column number.
The reason for this is that typically the lookup table is "static" meaning that you will always be looking up data in the leftmost column and then choosing which column to extract data from.
By placing the dollar sign before both the Column and Row numbers, you can drag the formula up, down and across as well as copy and paste it and always refer to the same table.
In your case, just using Absolute referencing for the Row will certainly work, it's just more common to lock down the entire table.