diff --git a/CHANGES.md b/CHANGES.md
index e7b06348..f1eafb1f 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -7,9 +7,9 @@ These endpoints have been added or updated since the last release.
 
 There are likely to be descriptions etc outside of the list below, but new query parameters, changes to headers, new endpoints should be listed.
 
-| Endpoint                                                                                                                                                             | [Lighthouse](https://github.com/sigp/lighthouse) | [Lodestar](https://github.com/ChainSafe/lodestar) | [Nimbus](https://github.com/status-im/nimbus-eth2) | [Prysm](https://github.com/prysmaticlabs/prysm) | [Teku](https://github.com/ConsenSys/teku) |
-|----------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------|---------------------------------------------------|----------------------------------------------------|-------------------------------------------------|-------------------------------------------|
-
+| Endpoint                                                                                                                        | [Lighthouse](https://github.com/sigp/lighthouse) | [Lodestar](https://github.com/ChainSafe/lodestar) | [Nimbus](https://github.com/status-im/nimbus-eth2) | [Prysm](https://github.com/prysmaticlabs/prysm) | [Teku](https://github.com/ConsenSys/teku) |
+|---------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------|---------------------------------------------------|----------------------------------------------------|-------------------------------------------------|-------------------------------------------|
+| [#316](https://github.com/ethereum/beacon-APIs/pull/316) `/eth/v2/debug/beacon/states` added `historical_summaries` to response |                                                  |                                                   |                                                    |                                                 |                                           |
 
 The Following are no longer in the Standard API, removed since the latest version.
 
diff --git a/types/capella/historical_summary.yaml b/types/capella/historical_summary.yaml
new file mode 100644
index 00000000..dc346ac3
--- /dev/null
+++ b/types/capella/historical_summary.yaml
@@ -0,0 +1,9 @@
+Capella:
+  HistoricalSummary:
+    type: object
+    description:  "The [`HistoricalSummary`](https://github.com/ethereum/consensus-specs/blob/v1.3.0/specs/capella/beacon-chain.md#historicalsummary) object from the CL Capella spec."
+    properties:
+      block_summary_root:
+        $ref: '../primitive.yaml#/Root'
+      state_summary_root:
+        $ref: '../primitive.yaml#/Root'
\ No newline at end of file
diff --git a/types/capella/state.yaml b/types/capella/state.yaml
index ece29ac4..624a63ac 100644
--- a/types/capella/state.yaml
+++ b/types/capella/state.yaml
@@ -25,7 +25,7 @@ Capella:
           $ref: '../primitive.yaml#/Root'
       historical_roots:
         type: array
-        description: "Variable length list, maximum 16777216 items"
+        description: "Variable length list, maximum 16777216 items. Frozen in Capella, replaced by historical_summaries."
         items:
           $ref: '../primitive.yaml#/Root'
       eth1_data:
@@ -86,3 +86,8 @@ Capella:
         $ref: "../primitive.yaml#/Uint64"
       next_withdrawal_validator_index:
         $ref: "../primitive.yaml#/Uint64"
+      historical_summaries:
+          type: array
+          items:
+            $ref: "./historical_summary.yaml#/Capella/HistoricalSummary"
+          description: "Variable length list, maximum 16777216 items"