diff --git a/docs/specs/clients/sign/data-structures.md b/docs/specs/clients/sign/data-structures.md
index ae76dce1..d7471df1 100644
--- a/docs/specs/clients/sign/data-structures.md
+++ b/docs/specs/clients/sign/data-structures.md
@@ -85,7 +85,8 @@ Proposal is sent by the proposer client to be approved or rejected by the respon
       "events": [string]
     }
   },
-  "pairingTopic": string
+  "pairingTopic": string,
+  "expiryTimestamp": number, // OPTIONAL timespamp in seconds
 }
 ```
 
diff --git a/docs/specs/clients/sign/session-events.md b/docs/specs/clients/sign/session-events.md
index 752604da..7673da63 100644
--- a/docs/specs/clients/sign/session-events.md
+++ b/docs/specs/clients/sign/session-events.md
@@ -80,7 +80,7 @@ For a properly formatted namespace, refer to the documentation [here](../../../s
     "params": {
         "id": 1675734656244887,
         "pairingTopic": "3c74583111ab5e006b03cbb0f252c667686e9fc01e675dff90aa8b18ec435feb",
-        "expiry": 1675734962,
+        "expiryTimestamp": 1675734962,
         "requiredNamespaces": {
             "eip155": {
                 "methods": [
@@ -164,7 +164,8 @@ Here's an example of a payload from a `session_request` when the request is for
                 }
             ]
         },
-        "chainId": "eip155:5"
+        "chainId": "eip155:5",
+        "expiryTimestamp": 1675734962
     }
 }
 ```