diff --git a/os/hal/include/i2c.h b/os/hal/include/i2c.h
index 1053712d0..80668f28c 100644
--- a/os/hal/include/i2c.h
+++ b/os/hal/include/i2c.h
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    i2c.h
diff --git a/os/hal/include/rtc.h b/os/hal/include/rtc.h
index 1264c5bd8..7b4e46f1f 100644
--- a/os/hal/include/rtc.h
+++ b/os/hal/include/rtc.h
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    rtc.h
diff --git a/os/hal/platforms/STM32/I2Cv1/i2c_lld.c b/os/hal/platforms/STM32/I2Cv1/i2c_lld.c
index 39872edd1..1f1664cec 100644
--- a/os/hal/platforms/STM32/I2Cv1/i2c_lld.c
+++ b/os/hal/platforms/STM32/I2Cv1/i2c_lld.c
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file STM32/i2c_lld.c
diff --git a/os/hal/platforms/STM32/I2Cv1/i2c_lld.h b/os/hal/platforms/STM32/I2Cv1/i2c_lld.h
index 81a9f62dc..29a9cc715 100644
--- a/os/hal/platforms/STM32/I2Cv1/i2c_lld.h
+++ b/os/hal/platforms/STM32/I2Cv1/i2c_lld.h
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file STM32/i2c_lld.h
diff --git a/os/hal/platforms/STM32/RTCv1/rtc_lld.c b/os/hal/platforms/STM32/RTCv1/rtc_lld.c
index b1555219c..1e9b6b9da 100644
--- a/os/hal/platforms/STM32/RTCv1/rtc_lld.c
+++ b/os/hal/platforms/STM32/RTCv1/rtc_lld.c
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    STM32/RTCv1/rtc_lld.c
diff --git a/os/hal/platforms/STM32/RTCv1/rtc_lld.h b/os/hal/platforms/STM32/RTCv1/rtc_lld.h
index 9237e4dc8..97a705fcf 100644
--- a/os/hal/platforms/STM32/RTCv1/rtc_lld.h
+++ b/os/hal/platforms/STM32/RTCv1/rtc_lld.h
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    STM32/RTCv1/rtc_lld.h
diff --git a/os/hal/platforms/STM32/RTCv2/rtc_lld.c b/os/hal/platforms/STM32/RTCv2/rtc_lld.c
index 89d688236..6f7a93457 100644
--- a/os/hal/platforms/STM32/RTCv2/rtc_lld.c
+++ b/os/hal/platforms/STM32/RTCv2/rtc_lld.c
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    STM32/RTCv2/rtc_lld.c
diff --git a/os/hal/platforms/STM32/RTCv2/rtc_lld.h b/os/hal/platforms/STM32/RTCv2/rtc_lld.h
index 23ceb3132..08d58c898 100644
--- a/os/hal/platforms/STM32/RTCv2/rtc_lld.h
+++ b/os/hal/platforms/STM32/RTCv2/rtc_lld.h
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    STM32/RTCv2/rtc_lld.h
diff --git a/os/hal/src/i2c.c b/os/hal/src/i2c.c
index 28dd99762..5cf5cb4f7 100644
--- a/os/hal/src/i2c.c
+++ b/os/hal/src/i2c.c
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    i2c.c
diff --git a/os/hal/src/rtc.c b/os/hal/src/rtc.c
index dda5a9c95..d7750001d 100644
--- a/os/hal/src/rtc.c
+++ b/os/hal/src/rtc.c
@@ -17,6 +17,10 @@
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
+/*
+   Concepts and parts of this file have been contributed by Uladzimir Pylinsky
+   aka barthess.
+ */
 
 /**
  * @file    rtc.c