diff --git a/src/routes/validate/measurement.ts b/src/routes/validate/measurement.ts
index b7b6650..60dae61 100644
--- a/src/routes/validate/measurement.ts
+++ b/src/routes/validate/measurement.ts
@@ -11,6 +11,7 @@ export default class MeasurementValidate {
           Joi.string().max(128),
           Joi.number(),
           Joi.boolean(),
+          Joi.array().items(Joi.array().items(Joi.number())),  // for spectra
           Joi.array()
         )
         .allow(null)