Mark 1:16

1:16 As he went along the Sea of Galilee, he saw Simon and Andrew, Simon’s brother, casting a net into the sea (for they were fishermen). ¹ 

Mark 6:17

6:17 For Herod himself had sent men, arrested John, and bound him in prison on account of Herodias, his brother Philip’s wife, because Herod ²  had married her.

[1:16]  ¹ sn This is a parenthetical comment by the author.

[6:17]  ² tn Grk “he”; here it is necessary to specify the referent as “Herod,” since the nearest previous antecedent in the translation is Philip.