diff --git a/ISSUES.txt b/ISSUES.txt
index 5bf6d41..8375c26 100644
--- a/ISSUES.txt
+++ b/ISSUES.txt
@@ -9,3 +9,5 @@ It seems like there is a need to add some idle frames at the beginning of a DMO
 YSF: There is an issue that need addressing: The data sent to aprs.fi from southern hemisphere users isn’t always correct. Maybe the GPS format used by YSF still has some secrets to reveal.
 
 P25: No obvious issues.
+
+General: The Windows serial handling isn't working with the STM32 series of devices. This needs investigating.