There is understandably a widespread interest in using Aura Microwave Limb Sounder (MLS) observations to examine the impact of the Hunga Tonga volcano on the stratosphere. MLS is certainly a unique resource in this regard, and we in the MLS team look forward to hearing about and/or participating in such research in the time ahead. In the meantime, we must underscore that MLS data should only be used if they meet the screening criteria described in the MLS data quality document. These criteria measure how well the retrieved profiles fit the atmospheric microwave spectra observed. A profile that does not meet these criteria does not fit the MLS-measured radiances well, and thus should not be considered a valid MLS measurement. We are in the early stages of evaluating the MLS observations of the clearly highly perturbed stratosphere, and will follow up with more information as it becomes evident. As ever, we welcome any queries from the user community. Many thanks to you all for your interest in and use of MLS data.