Unique Crochet Pattern for Textured Stitch with Spike Stitch Technique

The quantity of stitches is multiple of 4 + 1.
RND 1: In the 1st row, work 3 double crochets (dc) in the 5th chain stitch from the crochet hook, then chain 1. * Skip 3 chain stitches, work 3 dc in the next chain stitch, then chain 1.* Repeat from * to * across until the last 4 chain stitches. Skip 3 chain stitches and work 2 dc in the last chain stitch, then turn.
RND 2: In the 2nd row, chain 2. * Work (1 dc, 1 spike stitch, 1 dc) into the next 1 chain stitch space, then chain 1.* Repeat from * to * across, and work 2 dc in the beginning chain stitch space, then turn.
RND 3: In the 3rd row, chain 2. * Work (1 dc, 1 spike stitch, 1 dc) into the next 1 chain stitch space, then chain 1.* Repeat from * to * across, and work 2 dc in the beginning 2 chain stitches, then turn.
Repeat the 3rd row continuously for the desired length of your project.
what do you mean multiple plus one,? You add one at end if chain?
Yes, you understand it clearly