diff --git a/.env b/.env
index aba142f..84f2d46 100644
--- a/.env
+++ b/.env
@@ -1,4 +1,4 @@
-MDBOOK_VERSION=0.4.8
+MDBOOK_VERSION=0.4.18
 MDBOOK_LINKCHECK_VERSION=0.7.4
 MDBOOK_TOC_VERSION=0.6.3
 
diff --git a/src/SUMMARY.md b/src/SUMMARY.md
index c48ccf8..16d15ba 100644
--- a/src/SUMMARY.md
+++ b/src/SUMMARY.md
@@ -42,6 +42,7 @@
 
 - [Documentation](./documentation/summary.md)
     - [doc alias policy](./documentation/doc-alias-policy.md)
+    - [safety comments policy](./documentation/safety-comments.md)
 
 ---
 
diff --git a/src/documentation/safety-comments.md b/src/documentation/safety-comments.md
index 5cbe19d..f47544d 100644
--- a/src/documentation/safety-comments.md
+++ b/src/documentation/safety-comments.md
@@ -17,7 +17,7 @@ lint for `# Safety` sections by the way.
 
 [See the example on github][as_bytes_mut]
 
-```rust
+```rust,ignore
 /// Converts a mutable string slice to a mutable byte slice.
 ///
 /// # Safety
@@ -64,7 +64,7 @@ not check for `0` before dividing.
 
 [See the example on github][split_at]
 
-```rust
+```rust,ignore
 pub fn split_at(&self, mid: usize) -> (&str, &str) {
     // is_char_boundary checks that the index is in [0, .len()]
     if self.is_char_boundary(mid) {