Place a comma in the correct location in the sentence.
The photographs were taken by my brother a professional photographer.
The photographs were taken by my brother, a professional photographer.
Complete the following task based on the instruction and optional input provided.### Instruction:
Place a comma in the correct location in the sentence.

### Input:
The photographs were taken by my brother a professional photographer.

### Output:
The photographs were taken by my brother, a professional photographer.