diff --git a/slsDetectorSoftware/include/sls/Detector.h b/slsDetectorSoftware/include/sls/Detector.h
index 9859eb897..e4778ba1d 100644
--- a/slsDetectorSoftware/include/sls/Detector.h
+++ b/slsDetectorSoftware/include/sls/Detector.h
@@ -80,7 +80,9 @@ class Detector {
 
     Result<int64_t> getSerialNumber(Positions pos = {}) const;
 
-    /** [Gotthard2] */
+    /** [Gotthard2] Can overwrite and is sent out as mod_id in
+     * sls_detector_header in header of UDP data packet streamed out from
+     * detector.*/
     void setSerialNumber(const int64_t value, Positions pos = {});
 
     Result<int64_t> getReceiverVersion(Positions pos = {}) const;