# Can custom primers be used on the NovaSeq 6000 System?

Yes, the NovaSeq 6000 Cluster Cartridge and the NovaSeq Control Software allow for the use of custom sequencing primers for Read 1, Read 2, and the Index Reads.

Positions 5, 6, and 7 on the cluster cartridge are reserved for custom primers and the control software includes an option to select custom primers during run setup.

See the [NovaSeq Series Custom Primers Guide](https://support.illumina.com/downloads/novaseq-custom-primers-guide-1000000022266.html) for additional information.

If spiking custom primers into the Illumina primers, search for Knowledge Base article **Spiking custom primers into the Illumina sequencing primers**.

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