diff --git a/.unicornfig.yml b/.unicornfig.yml
index 391f80d..4d67c85 100644
--- a/.unicornfig.yml
+++ b/.unicornfig.yml
@@ -7,5 +7,5 @@ description: "This repository contains the original interface definitions of pub
   \ definitions can provide a better understanding of HPI Cloud APIs and help you\
   \ to utilize them more efficiently. You can also use these definitions with open\
   \ source tools to generate client libraries, documentation, and other artifacts."
-version: "0.0.5"
+version: "0.0.6"
 githubName: "HPI-de/hpi-cloud-apis"
diff --git a/CHANGELOG.md b/CHANGELOG.md
index bdf759c..0007809 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -19,6 +19,10 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 ## [Unreleased]
 
 
+## [0.0.6] - 2019-08-19
+### Added
+- **feedback:** add feedback definitions
+
 ## [0.0.5] - 2019-08-18
 ### BREAKING CHANGES
 - **course:** make CourseSeries more strict
@@ -61,7 +65,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.
 Initial release with NewsService.
 
 
-[Unreleased]: https://github.com/HPI-de/hpi-cloud-apis/compare/0.0.5...dev
+[Unreleased]: https://github.com/HPI-de/hpi-cloud-apis/compare/0.0.6...dev
+[0.0.6]: https://github.com/HPI-de/hpi-cloud-apis/compare/0.0.5...0.0.6
 [0.0.5]: https://github.com/HPI-de/hpi-cloud-apis/compare/0.0.4...0.0.5
 [0.0.4]: https://github.com/HPI-de/hpi-cloud-apis/compare/0.0.3...0.0.4
 [0.0.3]: https://github.com/HPI-de/hpi-cloud-apis/compare/0.0.2...0.0.3
diff --git a/build.gradle b/build.gradle
index ba749a1..6e671a3 100644
--- a/build.gradle
+++ b/build.gradle
@@ -35,7 +35,7 @@ ext {
     githubReleaseNotes = 'CHANGELOG.md'
     allLicenses = ["Apache-2.0"]
 
-    libraryVersion = "0.0.5"
+    libraryVersion = "0.0.6"
 }
 
 task sourcesJar(type: Jar, dependsOn: classes) {
diff --git a/hpi/cloud/feedback/v1test/feedback.proto b/hpi/cloud/feedback/v1test/feedback.proto
new file mode 100644
index 0000000..add9582
--- /dev/null
+++ b/hpi/cloud/feedback/v1test/feedback.proto
@@ -0,0 +1,28 @@
+syntax = "proto3";
+
+package hpi.cloud.feedback.v1test;
+
+option java_multiple_files = true;
+option java_outer_classname = "FeedbackBitProto";
+option java_package = "de.hpi.cloud.feedback.v1test";
+
+// A single feedback message, generated by a user.
+message Feedback {
+  // Required, output only. The unique ID of this feedback.
+  string id = 1;
+
+  // Required. The message.
+  string message = 2;
+
+  // The URI pointing to the screen currently opened by the user.
+  string screenUri = 3;
+
+  // Email address of the user sending the screenshot.
+  string user = 4;
+
+  // An optional screenshot, encoded as PNG.
+  bytes screenshot = 5;
+
+  // Optional log messages which might help to find a bug.
+  string log = 6;
+}
diff --git a/hpi/cloud/feedback/v1test/feedback_service.proto b/hpi/cloud/feedback/v1test/feedback_service.proto
new file mode 100644
index 0000000..e8a4f78
--- /dev/null
+++ b/hpi/cloud/feedback/v1test/feedback_service.proto
@@ -0,0 +1,21 @@
+syntax = "proto3";
+
+package hpi.cloud.feedback.v1test;
+
+import "hpi/cloud/feedback/v1test/feedback.proto";
+
+option java_multiple_files = true;
+option java_outer_classname = "FeedbackServiceProto";
+option java_package = "de.hpi.cloud.feedback.v1test";
+
+// Provides access to feedback generated by users.
+service FeedbackService {
+  // Create feedback.
+  rpc CreateFeedback(CreateFeedbackRequest) returns (Feedback);
+}
+
+// Request message for creating feedback using [ListInfoBits][hpi.cloud.feedback.v1test.FeedbackService.ListInfoBits].
+message CreateFeedbackRequest {
+  // Required. The feedback to store.
+  Feedback feedback = 1;
+}