diff --git a/person/person.json b/person/person.json
index 413ad39..7db444a 100644
--- a/person/person.json
+++ b/person/person.json
@@ -95,6 +95,54 @@
             }
           }
         },
+        {
+          "name": "activity",
+          "properties": {
+            "entity": {
+              "type": "string",
+              "enum": ["activity"],
+              "description": "Name of the entity to be queried."
+            },
+            "criteria": {
+              "type": "object",
+              "description": "Specific criteria for the activity entity.",
+              "properties": {
+                "network": {
+                  "type": "string",
+                  "description": "Name of a network."
+                },
+                "date": {
+                  "type": "object",
+                  "description": "The date of an activity entity.",
+                  "properties": {
+                    "from": {
+                      "type": "string",
+                      "description": "From date of date range for the activity entity. ISO date string."
+                    },
+                    "to": {
+                      "type": "string",
+                      "description": "To date of date range for the activity entity. ISO date string."
+                    }
+                  }
+                },
+                "type": {
+                  "type": "string",
+                  "enum": ["used","updated"],
+                  "description": "The type of activity to be queried. If type is not specified, both will be included."
+                },
+                "exists": {
+                  "type": "boolean",
+                  "description": "'true' to only return profiles that have this entity."
+                },
+                "filter": {
+                  "type": "string",
+                  "enum": ["LAST","ANY"],
+                  "description": "'LAST' indicates only last updated/used activity, 'ANY' indicates any updated/used activity. Default is 'LAST'."
+                }
+              }
+            }
+          }
+        },
         {
           "name": "country_code",
           "properties": {