diff --git a/agora/Agora/Proposal.hs b/agora/Agora/Proposal.hs
index 52e8378..97d0db9 100644
--- a/agora/Agora/Proposal.hs
+++ b/agora/Agora/Proposal.hs
@@ -595,6 +595,11 @@ deriving via
   instance
     (PConstantDecl ProposalVotes)
 
+{- | The effect script hashes and their associated datum hash and authority check script hash
+     belonging to a particular effect group or result.
+
+     @since 1.0.0
+-}
 type PProposalEffectGroup =
   PMap
     'Unsorted