diff --git a/UNSTABLE README.txt b/UNSTABLE README.txt
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+The commits where this file is present are not production grade.
+
+They contain in-development code to implement new features of Miosix, in particular the high-resolution timing infrastructure.
+
+They are known to break compiling on any architecture but the ones where development was done, namely:
+- stm32f407vg_stm32f4discovery
+- efm32gg332f1024_wandstem
+
+In addition, other bugs may be present.
+
+This file will be removed once the code is back to being production grade.