diff --git a/.github/workflows/website.yml b/.github/workflows/website.yml
index 3d4d507..6fbcc15 100644
--- a/.github/workflows/website.yml
+++ b/.github/workflows/website.yml
@@ -31,8 +31,11 @@ jobs:
             - name: Install mdBook
               run: cargo binstall --force -y mdbook mdbook-tabs
 
+            - name: Build Fortifier
+              run: cargo build -p fortifier
+
             - name: Run tests
-              run: mdbook test
+              run: mdbook test -L ../target/debug/deps
               working-directory: book
 
     book-build:
diff --git a/book/src/SUMMARY.md b/book/src/SUMMARY.md
index 9399e12..03adf53 100644
--- a/book/src/SUMMARY.md
+++ b/book/src/SUMMARY.md
@@ -2,4 +2,12 @@
 
 - [Introduction](./introduction.md)
 - [Getting Started](./getting-started.md)
+- [Validations](./validations/README.md)
+    - [Email]()
+    - [Length](./validations/length.md)
+    - [Regex]()
+    - [URL]()
+- [Integrations]()
+    - [Serde]()
+    - [Utoipa]()
 - [Contributing]()
diff --git a/book/src/validations/README.md b/book/src/validations/README.md
new file mode 100644
index 0000000..60505aa
--- /dev/null
+++ b/book/src/validations/README.md
@@ -0,0 +1,3 @@
+# Validations
+
+- [Length](./length.md)
diff --git a/book/src/validations/length.md b/book/src/validations/length.md
new file mode 100644
index 0000000..a93deeb
--- /dev/null
+++ b/book/src/validations/length.md
@@ -0,0 +1,86 @@
+# Length
+
+Validate the length of a string or iterable.
+
+```rust
+# extern crate fortifier;
+# use fortifier::Validate;
+#
+##[derive(Validate)]
+struct User {
+    #[validate(length(min = 1, max = 256))]
+    name: String
+}
+```
+
+## Types
+
+### String
+
+- [`str`](https://doc.rust-lang.org/std/primitive.str.html)
+- [`String`](https://doc.rust-lang.org/std/string/struct.String.html)
+
+Validate the amount of characters ([`chars`](https://doc.rust-lang.org/std/primitive.str.html#method.chars)) in a string.
+
+### Iterable
+
+- [`[T]` (slice)](https://doc.rust-lang.org/std/primitive.slice.html)
+- [`[T; N]` (array)](https://doc.rust-lang.org/std/primitive.array.html)
+- [`BTreeSet`](https://doc.rust-lang.org/std/collections/struct.BTreeSet.html)
+- [`BTreeMap`](https://doc.rust-lang.org/std/collections/struct.BTreeMap.html)
+- [`HashSet`](https://doc.rust-lang.org/std/collections/struct.HashSet.html)
+- [`HashMap`](https://doc.rust-lang.org/std/collections/struct.HashMap.html)
+- [`IndexSet`](https://docs.rs/indexmap/latest/indexmap/set/struct.IndexSet.html) (requires feature `indexmap`)
+- [`IndexMap`](https://docs.rs/indexmap/latest/indexmap/map/struct.IndexMap.html) (requires feature `indexmap`)
+- [`LinkedList`](https://doc.rust-lang.org/std/collections/struct.LinkedList.html)
+- [`Vec`](https://doc.rust-lang.org/std/vec/struct.Vec.html)
+- [`VecDeque`](https://doc.rust-lang.org/std/collections/struct.VecDeque.html)
+
+Validate the amount of entries in an iterable.
+
+## Options
+
+### Equal
+
+The length should be equal to the specified expression.
+
+```rust
+# extern crate fortifier;
+# use fortifier::Validate;
+#
+##[derive(Validate)]
+struct User {
+    #[validate(length(equal = 2))]
+    country_code: String
+}
+```
+
+### Minimum
+
+The length should be equal to or greater than the specified expression.
+
+```rust
+# extern crate fortifier;
+# use fortifier::Validate;
+#
+##[derive(Validate)]
+struct User {
+    #[validate(length(min = 1))]
+    name: String
+}
+```
+
+### Maximum
+
+The length should be equal to or less than the specified expression.
+
+```rust
+# extern crate fortifier;
+# use fortifier::Validate;
+#
+##[derive(Validate)]
+struct User {
+    #[validate(length(max = 256))]
+    name: String
+}
+```
diff --git a/packages/fortifier/src/validations/length.rs b/packages/fortifier/src/validations/length.rs
index 36f8f23..17a3c01 100644
--- a/packages/fortifier/src/validations/length.rs
+++ b/packages/fortifier/src/validations/length.rs
@@ -1,7 +1,7 @@
 use std::{
     borrow::Cow,
     cell::{Ref, RefMut},
-    collections::{BTreeMap, BTreeSet, HashMap, HashSet, VecDeque},
+    collections::{BTreeMap, BTreeSet, HashMap, HashSet, LinkedList, VecDeque},
     fmt::Display,
     rc::Rc,
     sync::Arc,
@@ -164,6 +164,7 @@ validate_with_len!(BTreeSet<T>, T);
 validate_with_len!(BTreeMap<K, V>, K, V);
 validate_with_len!(HashSet<T, S>, T, S);
 validate_with_len!(HashMap<K, V, S>, K, V, S);
+validate_with_len!(LinkedList<T>, T);
 validate_with_len!(Vec<T>, T);
 validate_with_len!(VecDeque<T>, T);
 #[cfg(feature = "indexmap")]