diff --git a/book/en/src/SUMMARY.md b/book/en/src/SUMMARY.md
index e1a4a330c7..68d8e2b03f 100644
--- a/book/en/src/SUMMARY.md
+++ b/book/en/src/SUMMARY.md
@@ -15,11 +15,11 @@
   - [v0.4.x to v0.5.x](./migration/migration_v4.md)
   - [RTFM to RTIC](./migration/migration_rtic.md)
 - [Under the hood](./internals.md)
-  - [Interrupt configuration](./internals/interrupt-configuration.md)
-  - [Non-reentrancy](./internals/non-reentrancy.md)
-  - [Access control](./internals/access.md)
-  - [Late resources](./internals/late-resources.md)
-  - [Critical sections](./internals/critical-sections.md)
-  - [Ceiling analysis](./internals/ceilings.md)
-  - [Software tasks](./internals/tasks.md)
-  - [Timer queue](./internals/timer-queue.md)
+  <!--- [Interrupt configuration](./internals/interrupt-configuration.md)-->
+  <!--- [Non-reentrancy](./internals/non-reentrancy.md)-->
+  <!--- [Access control](./internals/access.md)-->
+  <!--- [Late resources](./internals/late-resources.md)-->
+  <!--- [Critical sections](./internals/critical-sections.md)-->
+  <!--- [Ceiling analysis](./internals/ceilings.md)-->
+  <!--- [Software tasks](./internals/tasks.md)-->
+  <!--- [Timer queue](./internals/timer-queue.md)-->
diff --git a/book/en/src/internals.md b/book/en/src/internals.md
index 3b570248e0..9d7d5d79b6 100644
--- a/book/en/src/internals.md
+++ b/book/en/src/internals.md
@@ -1,5 +1,8 @@
 # Under the hood
 
+**This is chapter is currently work in progress,
+it will re-appear once it is more complete**
+
 This section describes the internals of the RTIC framework at a *high level*.
 Low level details like the parsing and code generation done by the procedural
 macro (`#[app]`) will not be explained here. The focus will be the analysis of
diff --git a/book/en/src/preface.md b/book/en/src/preface.md
index 041b3bd480..a0b0524033 100644
--- a/book/en/src/preface.md
+++ b/book/en/src/preface.md
@@ -9,9 +9,9 @@ This book contains user level documentation for the Real-Time Interrupt-driven C
 
 Formerly known as Real-Time For the Masses.
 
-There is a translation of this book in [Russian].
+<!--There is a translation of this book in [Russian].-->
 
-[Russian]: ../ru/index.html
+<!--[Russian]: ../ru/index.html-->
 
 This is the documentation of v0.6.x of RTIC; for the documentation of version