diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1e1dee6..406952a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,8 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Added
+- Add extras field to survey data [#39](https://github.com/rokwire/surveys-building-block/issues/39)
 ### Fixed
 - Fix "start_date" and "end_date" [#43](https://github.com/rokwire/surveys-building-block/issues/43)
 
diff --git a/core/model/surveys.go b/core/model/surveys.go
index a267eb7..16511ec 100644
--- a/core/model/surveys.go
+++ b/core/model/surveys.go
@@ -92,17 +92,18 @@ type SurveyStats struct {
 
 // SurveyData is data stored for a Survey
 type SurveyData struct {
-	Section             *string     `json:"section,omitempty" bson:"section,omitempty"`
-	Sections            []string    `json:"sections,omitempty" bson:"sections,omitempty"`
-	AllowSkip           bool        `json:"allow_skip" bson:"allow_skip"`
-	Text                string      `json:"text" bson:"text"`
-	MoreInfo            string      `json:"more_info" bson:"more_info"`
-	DefaultFollowUpKey  *string     `json:"default_follow_up_key" bson:"default_follow_up_key"`
-	DefaultResponseRule *string     `json:"default_response_rule" bson:"default_response_rule"`
-	FollowUpRule        *string     `json:"follow_up_rule" bson:"follow_up_rule"`
-	ScoreRule           *string     `json:"score_rule" bson:"score_rule"`
-	Replace             bool        `json:"replace" bson:"replace"`
-	Response            interface{} `json:"response" bson:"response"`
+	Section             *string                 `json:"section,omitempty" bson:"section,omitempty"`
+	Sections            []string                `json:"sections,omitempty" bson:"sections,omitempty"`
+	AllowSkip           bool                    `json:"allow_skip" bson:"allow_skip"`
+	Text                string                  `json:"text" bson:"text"`
+	MoreInfo            string                  `json:"more_info" bson:"more_info"`
+	DefaultFollowUpKey  *string                 `json:"default_follow_up_key" bson:"default_follow_up_key"`
+	DefaultResponseRule *string                 `json:"default_response_rule" bson:"default_response_rule"`
+	FollowUpRule        *string                 `json:"follow_up_rule" bson:"follow_up_rule"`
+	ScoreRule           *string                 `json:"score_rule" bson:"score_rule"`
+	Replace             bool                    `json:"replace" bson:"replace"`
+	Response            interface{}             `json:"response" bson:"response"`
+	Extras              *map[string]interface{} `json:"extras" bson:"extras"`
 
 	Type string `json:"type" bson:"type"`
 
diff --git a/driver/web/docs/gen/def.yaml b/driver/web/docs/gen/def.yaml
index fb824b2..51d0bb5 100644
--- a/driver/web/docs/gen/def.yaml
+++ b/driver/web/docs/gen/def.yaml
@@ -1498,6 +1498,9 @@ components:
           type: boolean
         response:
           type: object
+        extras:
+          type: object
+          nullable: true
         type:
           type: string
         correct_answer:
diff --git a/driver/web/docs/schemas/surveys/SurveyData.yaml b/driver/web/docs/schemas/surveys/SurveyData.yaml
index f904639..2e44a5f 100644
--- a/driver/web/docs/schemas/surveys/SurveyData.yaml
+++ b/driver/web/docs/schemas/surveys/SurveyData.yaml
@@ -20,6 +20,9 @@ properties:
     type: boolean
   response:
     type: object
+  extras:
+    type: object 
+    nullable: true 
   type:
     type: string
   correct_answer: