diff --git a/.github/PULL_REQUEST_TEMPLATE.md b/.github/PULL_REQUEST_TEMPLATE.md
index 85f34f3321..56e5df6cd2 100644
--- a/.github/PULL_REQUEST_TEMPLATE.md
+++ b/.github/PULL_REQUEST_TEMPLATE.md
@@ -3,7 +3,7 @@
Please, Make sure that your PR is not a duplicate.
Search among the [Pull request](https://github.com/stm32duino/Arduino_Core_STM32/pulls) before creating one.
-IMPORTANT: Please review the [CONTRIBUTING.md](../CONTRIBUTING.md) file for detailed contributing guidelines.
+IMPORTANT: Please review the [CONTRIBUTING.md](https://github.com/stm32duino/Arduino_Core_STM32/blob/main/CONTRIBUTING.md) file for detailed contributing guidelines.
Thanks for submitting a pull request.
Please provide enough information so that others can review your pull request:
diff --git a/cores/arduino/HardwareSerial.h b/cores/arduino/HardwareSerial.h
index bfd94620ba..d319ab3ea5 100644
--- a/cores/arduino/HardwareSerial.h
+++ b/cores/arduino/HardwareSerial.h
@@ -35,11 +35,6 @@
// location from which to read.
// NOTE: a "power of 2" buffer size is recommended to dramatically
// optimize all the modulo operations for ring buffers.
-// WARNING: When buffer sizes are increased to > 256, the buffer index
-// variables are automatically increased in size, but the extra
-// atomicity guards needed for that are not implemented. This will
-// often work, but occasionally a race condition can occur that makes
-// Serial behave erratically. See https://github.com/arduino/Arduino/issues/2405
#if !defined(SERIAL_TX_BUFFER_SIZE)
#define SERIAL_TX_BUFFER_SIZE 64
#endif
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