diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md
index a16f7ceca52..466cbc9b14e 100644
--- a/book/src/SUMMARY.md
+++ b/book/src/SUMMARY.md
@@ -5,5 +5,6 @@
 - [Getting started](./getting_started.md)
 - [Generating inputs from rustc](./generate_inputs.md)
 - [Rules](./rules.md)
+  - [Atoms](./rules/atoms.md)
   - [Initialization](./rules/initialization.md)
 - [See also](./see_also.md)
diff --git a/book/src/rules/atoms.md b/book/src/rules/atoms.md
new file mode 100644
index 00000000000..100e82ccf93
--- /dev/null
+++ b/book/src/rules/atoms.md
@@ -0,0 +1 @@
+**To be written**
diff --git a/book/src/rules/initialization.md b/book/src/rules/initialization.md
index 7597c975219..f0dfe5efa5e 100644
--- a/book/src/rules/initialization.md
+++ b/book/src/rules/initialization.md
@@ -1 +1,3 @@
 # Initialization
+
+**These rules are not yet fully merged.**