diff --git a/components/esm/refid.hpp b/components/esm/refid.hpp
index 2e11da59ab..6bc49313d0 100644
--- a/components/esm/refid.hpp
+++ b/components/esm/refid.hpp
@@ -10,6 +10,9 @@ namespace ESM
 {
     struct RefId
     {
+        // This structure is used to represent an Id that identifies an ESM record. These Ids can then be used in
+        // ESM::Stores to find the actual record. These Ids can be serialized/de-serialized, stored on disk and remain
+        // valid. They are used by ESM files, by records to reference other ESM records.
         const static RefId sEmpty;
         bool empty() const { return mId.empty(); }
         void swap(RefId& rhs) { mId.swap(rhs.mId); }