API error? for fueltech_mix

[gurrier]

Based on reading of the documentation
https://api.opennem.org.au/docs#operation/Fueltech_mix_by_network_stats_fueltech_mix__network_id__get

I thought that this call would return successfully
https://api.opennem.org.au/stats/fueltech_mix/NEM

But I get an error
{"detail":[{"loc":["query","network_code"],"msg":"field required","type":"value_error.missing"}]}

What am I missing? Any help greatly appreciated and thanks for the excellent Opennem asset.