diff --git a/scls-cardano/cddl-src/Cardano/SCLS/CDDL.hs b/scls-cardano/cddl-src/Cardano/SCLS/CDDL.hs
index 61b12f76..943aaeca 100644
--- a/scls-cardano/cddl-src/Cardano/SCLS/CDDL.hs
+++ b/scls-cardano/cddl-src/Cardano/SCLS/CDDL.hs
@@ -12,6 +12,7 @@ import Cardano.SCLS.Namespace.Blocks qualified as Blocks
 import Cardano.SCLS.Namespace.EntitiesCommittee qualified as EntitiesCommittee
 import Cardano.SCLS.Namespace.EntitiesDReps qualified as EntitiesDReps
 import Cardano.SCLS.Namespace.EntitiesStakePools qualified as EntitiesStakePools
+import Cardano.SCLS.Namespace.EntitiesDormantEpochs qualified as EntitiesDormantEpochs
 import Cardano.SCLS.Namespace.GovCommittee qualified as GovCommittee
 import Cardano.SCLS.Namespace.GovConstitution qualified as GovConstitution
 import Cardano.SCLS.Namespace.GovPParams qualified as GovPParams
@@ -64,6 +65,9 @@ instance KnownSpec "entities/dreps/v0" where
 instance KnownSpec "entities/stake_pools/v0" where
   namespaceSpec _ = mkDefinition EntitiesStakePools.record_entry
 
+instance KnownSpec "entities/dormant_epochs/v0" where
+  namespaceSpec _ = mkDefinition EntitiesDormantEpochs.record_entry
+
 instance KnownSpec "gov/committee/v0" where
   namespaceSpec _ = mkDefinition GovCommittee.record_entry
 
@@ -97,6 +101,7 @@ knownNamespaces =
   , mkNamespaceSymbol @"entities/committee/v0"
   , mkNamespaceSymbol @"entities/dreps/v0"
   , mkNamespaceSymbol @"entities/stake_pools/v0"
+  , mkNamespaceSymbol @"entities/dormant_epochs/v0"
   , mkNamespaceSymbol @"gov/committee/v0"
   , mkNamespaceSymbol @"gov/constitution/v0"
   , mkNamespaceSymbol @"gov/pparams/v0"
@@ -113,6 +118,7 @@ type instance Spec.NamespaceKeySize "snapshots/go/v0" = 31 -- 1 byte for hash ty
 type instance Spec.NamespaceKeySize "entities/committee/v0" = 8
 type instance Spec.NamespaceKeySize "entities/dreps/v0" = 29 -- 1 byte for tag, 28 bytes for hash
 type instance Spec.NamespaceKeySize "entities/stake_pools/v0" = 28
+type instance Spec.NamespaceKeySize "entities/dormant_epochs/v0" = 1
 type instance Spec.NamespaceKeySize "gov/committee/v0" = 8
 type instance Spec.NamespaceKeySize "gov/constitution/v0" = 8
 type instance Spec.NamespaceKeySize "gov/pparams/v0" = 4
diff --git a/scls-cardano/cddl-src/Cardano/SCLS/Namespace/EntitiesDormantEpochs.hs b/scls-cardano/cddl-src/Cardano/SCLS/Namespace/EntitiesDormantEpochs.hs
new file mode 100644
index 00000000..53460491
--- /dev/null
+++ b/scls-cardano/cddl-src/Cardano/SCLS/Namespace/EntitiesDormantEpochs.hs
@@ -0,0 +1,37 @@
+{-# LANGUAGE ImportQualifiedPost #-}
+{-# LANGUAGE OverloadedLists #-}
+{-# LANGUAGE OverloadedStrings #-}
+{-# LANGUAGE QuasiQuotes #-}
+{-# LANGUAGE TypeApplications #-}
+{-# LANGUAGE NoImplicitPrelude #-}
+{-# OPTIONS_GHC -Wno-unrecognised-pragmas #-}
+
+{-# HLINT ignore "Use camelCase" #-}
+module Cardano.SCLS.Namespace.EntitiesDormantEpochs where
+
+import Cardano.SCLS.Common
+import Codec.CBOR.Cuddle.Huddle
+import Data.Function (($))
+import Text.Heredoc (str)
+
+record_entry :: Rule
+record_entry =
+  comment
+    [str| The key for the namespace
+        |
+        | ```
+        | meta:
+        |   endian: be
+        |
+        | seq:
+        |   - id: key
+        |     type: singleton
+        |
+        | types:
+        |   singleton:
+        |     size: 1
+        |     type: u1
+        |     const: 0
+        | ```
+        |]
+    $ "record_entry" =:= epoch_no
diff --git a/scls-cardano/scls-cardano.cabal b/scls-cardano/scls-cardano.cabal
index cb390b3d..33ebd268 100644
--- a/scls-cardano/scls-cardano.cabal
+++ b/scls-cardano/scls-cardano.cabal
@@ -34,6 +34,7 @@ library
     Cardano.SCLS.Namespace.EntitiesCommittee
     Cardano.SCLS.Namespace.EntitiesDReps
     Cardano.SCLS.Namespace.EntitiesStakePools
+    Cardano.SCLS.Namespace.EntitiesDormantEpochs
     Cardano.SCLS.Namespace.GovCommittee
     Cardano.SCLS.Namespace.GovConstitution
     Cardano.SCLS.Namespace.GovPParams
diff --git a/scls-cardano/test/Reference.hs b/scls-cardano/test/Reference.hs
index d9f820f2..c477f42f 100644
--- a/scls-cardano/test/Reference.hs
+++ b/scls-cardano/test/Reference.hs
@@ -72,6 +72,7 @@ allReferenceCDDLs =
   , ("entities/committee/v0", "entities_committee_v0.cddl")
   , ("entities/dreps/v0", "entities_dreps_v0.cddl")
   , ("entities/stake_pools/v0", "entities_stake_pools_v0.cddl")
+  , ("entities/dormant_epochs/v0", "entities_dormant_epochs_v0.cddl")
   , ("gov/committee/v0", "gov_committee_v0.cddl")
   , ("gov/constitution/v0", "gov_constitution_v0.cddl")
   , ("gov/pparams/v0", "gov_pparams_v0.cddl")
diff --git a/scls-cardano/testlib/Cardano/SCLS/Testlib.hs b/scls-cardano/testlib/Cardano/SCLS/Testlib.hs
index 4c17b8ed..075044e8 100644
--- a/scls-cardano/testlib/Cardano/SCLS/Testlib.hs
+++ b/scls-cardano/testlib/Cardano/SCLS/Testlib.hs
@@ -58,6 +58,7 @@ testAllNS ::
   , ConstrNS "entities/committee/v0"
   , ConstrNS "entities/dreps/v0"
   , ConstrNS "entities/stake_pools/v0"
+  , ConstrNS "entities/dormant_epochs/v0"
   , ConstrNS "gov/committee/v0"
   , ConstrNS "gov/constitution/v0"
   , ConstrNS "gov/pparams/v0"
@@ -74,6 +75,7 @@ testAllNS = describe "scls/conformance" $ do
   testNS @"entities/committee/v0"
   testNS @"entities/dreps/v0"
   testNS @"entities/stake_pools/v0"
+  testNS @"entities/dormant_epochs/v0"
   testNS @"gov/committee/v0"
   testNS @"gov/constitution/v0"
   testNS @"gov/pparams/v0"