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# Preface
This book contains user level documentation for the Real Time For the Masses
-(RTFM) framework. The API reference can be found [here](../api/rtfm/index.html).
+(RTFM) framework. The API reference can be found [here](../../api/rtfm/index.html).
There is a translation of this book in [Russian].
[Russian]: ../ru/index.html
-**HEADS UP** This is an **alpha** pre-release; there may be breaking changes in
+This is the documentation of v0.5.x of RTFM; for the documentation of version
+v0.4.x go [here](../../0.4/book/en).
+
+**HEADS UP** This is a **beta** pre-release; there may be breaking changes in
the API and semantics before a proper release is made.
{{#include ../../../README.md:5:44}}