diff --git a/FIPS/fip-0090.md b/FIPS/fip-0090.md
index e3d28aca7..78f11d04e 100644
--- a/FIPS/fip-0090.md
+++ b/FIPS/fip-0090.md
@@ -99,8 +99,10 @@ Note that, same as with interactive PoRep, each sector has a `SealRandEpoch` tha
   ```go
   // Note no UnsealedCID because it must be "zero" data.
   struct SectorNIActivationInfo {
-      SectorNumber: SectorNumber,
+      SealingNumber: SectorNumber, // Sector number used to generate replica id
+      SealerID: ActorID, // Must be set to ID of receiving actor for now
       SealedCID: Cid, // CommR
+      SectorNumber: SectorNumber, // unique id of sector in actor state
       SealRandEpoch: ChainEpoch,
       Expiration: ChainEpoch,
   }