diff --git a/lib/posthog/client.rb b/lib/posthog/client.rb
index cc346f9..51a2b8e 100644
--- a/lib/posthog/client.rb
+++ b/lib/posthog/client.rb
@@ -50,7 +50,7 @@ def initialize(opts = {})
           @api_key,
           opts[:host]
         )
-      
+
       @distinct_id_has_sent_flag_calls = SizeLimitedHash.new(Defaults::MAX_HASH_SIZE) { |hash, key| hash[key] = Array.new }
 
       at_exit { @worker_thread && @worker_thread[:should_exit] = true }
@@ -87,6 +87,7 @@ def clear
     # @option attrs [String] :event Event name
     # @option attrs [Hash] :properties Event properties (optional)
     # @option attrs [Bool] :send_feature_flags Whether to send feature flags with this event (optional)
+    # @option attrs [String] :uuid ID that uniquely identifies an event
     # @macro common_attrs
     def capture(attrs)
       symbolize_keys! attrs
@@ -160,7 +161,7 @@ def is_feature_enabled(flag_key, distinct_id, groups: {}, person_properties: {},
     # @param [Hash] groups
     # @param [Hash] person_properties key-value pairs of properties to associate with the user.
     # @param [Hash] group_properties
-    # 
+    #
     # @return [String, nil] The value of the feature flag
     #
     # The provided properties are used to calculate feature flags locally, if possible.
@@ -202,7 +203,7 @@ def get_feature_flag(key, distinct_id, groups: {}, person_properties: {}, group_
     # @param [Hash] groups
     # @param [Hash] person_properties key-value pairs of properties to associate with the user.
     # @param [Hash] group_properties
-    # 
+    #
     # @return [Hash] String (not symbol) key value pairs of flag and their values
     def get_all_flags(distinct_id, groups: {}, person_properties: {}, group_properties: {}, only_evaluate_locally: false)
       person_properties, group_properties = add_local_person_and_group_properties(distinct_id, groups, person_properties, group_properties)
diff --git a/lib/posthog/field_parser.rb b/lib/posthog/field_parser.rb
index fb72982..25fc6b1 100644
--- a/lib/posthog/field_parser.rb
+++ b/lib/posthog/field_parser.rb
@@ -8,12 +8,14 @@ class << self
       # - "event"
       # - "properties"
       # - "groups"
+      # - "uuid"
       def parse_for_capture(fields)
         common = parse_common_fields(fields)
 
         event = fields[:event]
         properties = fields[:properties] || {}
         groups = fields[:groups]
+        uuid = fields[:uuid]
 
         check_presence!(event, 'event')
         check_is_hash!(properties, 'properties')
@@ -23,6 +25,11 @@ def parse_for_capture(fields)
           properties["$groups"] = groups
         end
 
+        if uuid
+          check_is_uuid!(uuid)
+          common[:uuid] = uuid
+        end
+
         isoify_dates! properties
 
         common.merge(
@@ -164,6 +171,12 @@ def check_presence!(obj, name)
       def check_is_hash!(obj, name)
         raise ArgumentError, "#{name} must be a Hash" unless obj.is_a? Hash
       end
+
+      def check_is_uuid!(uuid)
+        unless uuid.match?(/^[0-9a-f]{8}-([0-9a-f]{4}-){3}[0-9a-f]{12}$/i)
+          raise ArgumentError, "uuid is not formated like a uuid"
+        end
+      end
     end
   end
 end