diff --git a/src/db/data.h b/src/db/data.h
index f3fac0f..5ebb7be 100644
--- a/src/db/data.h
+++ b/src/db/data.h
@@ -217,8 +217,8 @@ namespace db
   {
     transaction_link link;    //!< Orders and links `spend` to `output`.
     crypto::key_image image;  //!< Unique ID for the spend
-    // `link` and `image` must in this order for LMDB optimizations
     output_id source;         //!< The output being spent
+    // `link`, `image`, and source must in this order for LMDB optimizations
     std::uint64_t timestamp;  //!< Timestamp of spend
     std::uint64_t unlock_time;//!< Unlock time of spend
     std::uint32_t mixin_count;//!< Ring-size of TX output