diff --git a/docs/ecolyo/functionalities/feedback.md b/docs/ecolyo/functionalities/feedback.md
new file mode 100644
index 0000000000000000000000000000000000000000..4a3b5ea77f5322e40f208d4cb266076b347b6100
--- /dev/null
+++ b/docs/ecolyo/functionalities/feedback.md
@@ -0,0 +1,32 @@
+# Feedback
+
+Users can send a feedback in the application, the feedback's receiver is defined in the _FeedbackModal component_
+
+## Add mail attachments
+
+The user has the possibility to add an image to a feedback.
+
+The email informations are created in the _sendEmail_ function and the mailData respects this scheme :
+
+```js
+const mailData = {
+  mode: "from",
+  to: [{ name: "Support", email: "receiver-email" }],
+  subject: "Your subject",
+  parts: [{ type: "text/plain", body: mailContent }],
+  attachments: [{ filename: "test.png", content: "base64file" }],
+};
+```
+
+It is important that your file is sent base64 encoded to the sendmail job and with the _data...base64_ headers removed, otherwise it will be unreadable.
+In order to do this, we use a reader to read the file as Data URL
+
+```js
+reader.readAsDataURL(file);
+```
+
+and then apply to the result so we send only the encoded part without its headers.
+
+```js
+split(",")[1];
+```
diff --git a/mkdocs.yml b/mkdocs.yml
index c1c42eb395d8039f3a62522ec1b6c91e655cbaf0..6130717ef2570ad1aa19ea988ebb99a06376a78d 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -45,10 +45,9 @@ nav:
           - Description: ecolyo/application/description.md
           - Redux: ecolyo/application/redux.md
           - Scaffolding: ecolyo/application/scaffolding.md
-          - Services: ecolyo/application/services.md
           - Gitflow: ecolyo/application/gitflow.md
           - Deploy: ecolyo/application/deploy.md
-      - Services: 
+      - Services:
           - Description: ecolyo/services/index.md
           - Monthly report notification: ecolyo/services/monthly_report_notification.md
           - Aggregator usage events: ecolyo/services/aggregator_usage_events.md
@@ -60,6 +59,7 @@ nav:
           - Profile Type: ecolyo/functionalities/profile_type.md
           - Analysis: ecolyo/functionalities/analysis.md
           - Usage events tracking: ecolyo/functionalities/usage_events_tracking.md
+          - Feedback: ecolyo/functionalities/feedback.md
   - Pilote:
       - Pilote - TS - Back:
           - Index: pilote/Pilote - TS - Back/index.md