diff --git a/src/adrs/0009-nexus-file-format.md b/src/adrs/0009-nexus-file-format.md
index 3f0d7ee..c144f45 100644
--- a/src/adrs/0009-nexus-file-format.md
+++ b/src/adrs/0009-nexus-file-format.md
@@ -16,7 +16,8 @@ To ensure this, it is advisable that the pipeline's output format conform to a s
 
 ## Decision
 
-The Nexus Writer will write output conforming to a standard detailed in the components doc files. Wherever possible this standard conforms to [Muon Instrument Definition: Version 2 – 'muonTD'](https://www.nexusformat.org/content/Muon_Time_Differential.html). The main deviation is that the [NXdata](https://manual.nexusformat.org/classes/base_classes/NXdata.html) class in the `raw_data_1/detector_1` field is replaced with the [NXevent_data](https://manual.nexusformat.org/classes/base_classes/NXevent_data.html) class, as this is designed for storing streamed event data.
+The Nexus Writer will write output conforming to a standard detailed in the components doc files. Wherever possible, this standard conforms to
+the standard set out in Stephen Cottrell's June 2021 paper "NeXus Instrument Definitions for Muon Data". The main deviation is that the [NXdata](https://manual.nexusformat.org/classes/base_classes/NXdata.html) class in the `raw_data_1/detector_1` field is replaced with the [NXevent_data](https://manual.nexusformat.org/classes/base_classes/NXevent_data.html) class, as this is designed for storing streamed event data.
 
 ## Consequences