diff --git a/nx/include/switch/services/ns.h b/nx/include/switch/services/ns.h
index 9ef57ce6..06a4fcfc 100644
--- a/nx/include/switch/services/ns.h
+++ b/nx/include/switch/services/ns.h
@@ -104,11 +104,11 @@ typedef struct {
 /// SystemDeliveryInfo
 typedef struct {
     u32 protocol_version;           ///< Must be <= to and match a system-setting.
-    u8 unk_x4[0x8];                 ///< Unused by NS, besides HMAC validation.
+    u8 unk_x4[0x8];                 ///< Unused by \ref nssuRequestSendSystemUpdate / \ref nssuControlRequestReceiveSystemUpdate, besides HMAC validation.
     u32 systemupdate_meta_version;  ///< SystemUpdate meta version.
     u64 systemupdate_meta_titleid;  ///< SystemUpdate meta titleID.
     u8 unk_x18;                     ///< Copied into state by \ref nssuRequestSendSystemUpdate.
-    u8 unk_x19[0xc7];               ///< Unused by NS, besides HMAC validation.
+    u8 unk_x19[0xc7];               ///< Unused by \ref nssuRequestSendSystemUpdate / \ref nssuControlRequestReceiveSystemUpdate, besides HMAC validation.
     u8 hmac[0x20];                  ///< HMAC-SHA256 over the previous 0xe0-bytes.
 } NsSystemDeliveryInfo;