diff --git a/Dev-build-versions.md b/Dev-build-versions.md
index b15bf52..ef66500 100644
--- a/Dev-build-versions.md
+++ b/Dev-build-versions.md
@@ -2,6 +2,8 @@ We are trying to work out what is the most recent version we can update to while
 
 Developer testing with various GCC compiler and hardware versions demonstrates code stability, and helps suss out intermittent issues such as timing issues or uninitialized memory.  But, particularly if the nightly build system uses a different GCC version from most developers, a developer-testing phase may be needed for future firmware release candidates before the worldwide release announcement.
 
+Note that higher GCC versions contain larger libraries that consume more of our limited ROM space.
+
 | Dev      | GCC Version | Platform     | Issues|
 |----------|-------------|--------------|--------------|
 | Stable/nightly | 9.2.1       | ubuntu:20.04 | ADSB fails in v1.8.0 (some claim other versions too TBD) |