diff --git a/contributors b/contributors
index 3be9f316..88003c67 100644
--- a/contributors
+++ b/contributors
@@ -1,4 +1,6 @@
 Giso Grimm
-Tobias Herzke
-Joanna Luberadzka
-Merle Gerken
+Tobias Herzke (code review)
+Fenja Schwark (hrtf receiver)
+Merle Gerken (hoa3d receiver)
+Joanna Luberadzka (documentation)
+Tobias Hegemann (cmake files)
\ No newline at end of file
diff --git a/libtascar/src/audioplugin.cc b/libtascar/src/audioplugin.cc
index bcf5f268..557bf437 100644
--- a/libtascar/src/audioplugin.cc
+++ b/libtascar/src/audioplugin.cc
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2018 Giso Grimm
  * Copyright (c) 2019 Giso Grimm
- * Copyright (c) 2020 Giso Grimm, Tobias Hegemann
+ * Copyright (c) 2020 Giso Grimm
  * Copyright (c) 2021 Giso Grimm
  */
 /*
diff --git a/libtascar/src/cli.cc b/libtascar/src/cli.cc
index 4f48d4c0..f9e41255 100644
--- a/libtascar/src/cli.cc
+++ b/libtascar/src/cli.cc
@@ -3,7 +3,6 @@
  *
  * Copyright (c) 2018 Giso Grimm
  * Copyright (c) 2020 Giso Grimm
- * Copyright (c) 2021 Tobias Hegemann
  */
 /*
  * TASCAR is free software: you can redistribute it and/or modify
diff --git a/libtascar/src/maskplugin.cc b/libtascar/src/maskplugin.cc
index 906b3bc6..3438ea66 100644
--- a/libtascar/src/maskplugin.cc
+++ b/libtascar/src/maskplugin.cc
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2018 Giso Grimm
  * Copyright (c) 2019 Giso Grimm
- * Copyright (c) 2020 Giso Grimm, Tobias Hegemann
+ * Copyright (c) 2020 Giso Grimm
  * Copyright (c) 2021 Giso Grimm
  */
 /*
diff --git a/libtascar/src/receivermod.cc b/libtascar/src/receivermod.cc
index d6bbba1f..8cf9007f 100644
--- a/libtascar/src/receivermod.cc
+++ b/libtascar/src/receivermod.cc
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2018 Giso Grimm
  * Copyright (c) 2019 Giso Grimm
- * Copyright (c) 2020 Giso Grimm, Tobias Hegemann
+ * Copyright (c) 2020 Giso Grimm
  * Copyright (c) 2021 Giso Grimm
  */
 /*
diff --git a/libtascar/src/session.cc b/libtascar/src/session.cc
index df0dae7d..1795ace0 100644
--- a/libtascar/src/session.cc
+++ b/libtascar/src/session.cc
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2018 Giso Grimm
  * Copyright (c) 2019 Giso Grimm
- * Copyright (c) 2020 Giso Grimm, Tobias Hegemann
+ * Copyright (c) 2020 Giso Grimm
  * Copyright (c) 2021 Giso Grimm
  */
 /*
diff --git a/libtascar/src/sourcemod.cc b/libtascar/src/sourcemod.cc
index e947d96b..4b432876 100644
--- a/libtascar/src/sourcemod.cc
+++ b/libtascar/src/sourcemod.cc
@@ -2,7 +2,7 @@
  * This file is part of the TASCAR software, see <http://tascar.org/>
  *
  * Copyright (c) 2018 Giso Grimm
- * Copyright (c) 2020 Giso Grimm, Tobias Hegemann
+ * Copyright (c) 2020 Giso Grimm
  * Copyright (c) 2021 Giso Grimm
  */
 /*
diff --git a/libtascar/src/tictoctimer.cc b/libtascar/src/tictoctimer.cc
index a1ea2699..a9f4f8be 100644
--- a/libtascar/src/tictoctimer.cc
+++ b/libtascar/src/tictoctimer.cc
@@ -3,7 +3,7 @@
  *
  * Copyright (c) 2018 Giso Grimm
  * Copyright (c) 2019 Giso Grimm
- * Copyright (c) 2020 Giso Grimm, Tobias Hegemann
+ * Copyright (c) 2020 Giso Grimm
  * Copyright (c) 2021 Giso Grimm
  */
 /*
diff --git a/plugins/src/tascar_ap_feedbackdelay.cc b/plugins/src/tascar_ap_feedbackdelay.cc
index c282de00..50c72c06 100644
--- a/plugins/src/tascar_ap_feedbackdelay.cc
+++ b/plugins/src/tascar_ap_feedbackdelay.cc
@@ -2,7 +2,7 @@
  * This file is part of the TASCAR software, see <http://tascar.org/>
  *
  * Copyright (c) 2019 Giso Grimm
- * Copyright (c) 2020 Giso Grimm, Tobias Hegemann
+ * Copyright (c) 2020 Giso Grimm
  * Copyright (c) 2021 Giso Grimm
  */
 /*