diff --git a/BitFaster.Caching/Lfu/Builder/AsyncConcurrentLfuBuilder.cs b/BitFaster.Caching/Lfu/Builder/AsyncConcurrentLfuBuilder.cs
index 7560229e..08c41b1f 100644
--- a/BitFaster.Caching/Lfu/Builder/AsyncConcurrentLfuBuilder.cs
+++ b/BitFaster.Caching/Lfu/Builder/AsyncConcurrentLfuBuilder.cs
@@ -6,7 +6,6 @@ namespace BitFaster.Caching.Lfu.Builder
     /// </summary>
     /// <typeparam name="K">The type of the cache key.</typeparam>
     /// <typeparam name="V">The type of the cache value.</typeparam>
-    /// <typeparam name="W">The type of the wrapped cache value.</typeparam>
     public sealed class AsyncConcurrentLfuBuilder<K, V> : LfuBuilderBase<K, V, AsyncConcurrentLfuBuilder<K, V>, IAsyncCache<K, V>>
     {
         internal AsyncConcurrentLfuBuilder(LfuInfo<K> info)
diff --git a/BitFaster.Caching/Lfu/Builder/AtomicConcurrentLfuBuilder.cs b/BitFaster.Caching/Lfu/Builder/AtomicConcurrentLfuBuilder.cs
index c35bd110..81b35f4e 100644
--- a/BitFaster.Caching/Lfu/Builder/AtomicConcurrentLfuBuilder.cs
+++ b/BitFaster.Caching/Lfu/Builder/AtomicConcurrentLfuBuilder.cs
@@ -1,10 +1,13 @@
-using System;
-using System.Collections.Generic;
-using System.Text;
+
 using BitFaster.Caching.Atomic;
 
 namespace BitFaster.Caching.Lfu.Builder
 {
+    /// <summary>
+    /// A builder for creating a ConcurrentLfu as IAsyncCache with atomic value creation.
+    /// </summary>
+    /// <typeparam name="K">The type of the cache key.</typeparam>
+    /// <typeparam name="V">The type of the cache value.</typeparam>
     public class AtomicConcurrentLfuBuilder<K, V> : LfuBuilderBase<K, V, AtomicConcurrentLfuBuilder<K, V>, ICache<K, V>>
     {
         private readonly ConcurrentLfuBuilder<K, AtomicFactory<K, V>> inner;
diff --git a/BitFaster.Caching/Lfu/Builder/AtomicScopedAsyncConcurrentLfuBuilder.cs b/BitFaster.Caching/Lfu/Builder/AtomicScopedAsyncConcurrentLfuBuilder.cs
index e8f68a0e..9cb9ec9d 100644
--- a/BitFaster.Caching/Lfu/Builder/AtomicScopedAsyncConcurrentLfuBuilder.cs
+++ b/BitFaster.Caching/Lfu/Builder/AtomicScopedAsyncConcurrentLfuBuilder.cs
@@ -1,10 +1,13 @@
 using System;
-using System.Collections.Generic;
-using System.Text;
 using BitFaster.Caching.Atomic;
 
 namespace BitFaster.Caching.Lfu.Builder
 {
+    /// <summary>
+    /// A builder for creating a ConcurrentLfu as IScopedAsyncCache with atomic value creation.
+    /// </summary>
+    /// <typeparam name="K">The type of the cache key.</typeparam>
+    /// <typeparam name="V">The type of the cache value.</typeparam>
     public sealed class AtomicScopedAsyncConcurrentLfuBuilder<K, V> : LfuBuilderBase<K, V, AtomicScopedAsyncConcurrentLfuBuilder<K, V>, IScopedAsyncCache<K, V>> where V : IDisposable
     {
         private readonly AsyncConcurrentLfuBuilder<K, ScopedAsyncAtomicFactory<K, V>> inner;
diff --git a/BitFaster.Caching/Lfu/Builder/ScopedAsyncConcurrentLfuBuilder.cs b/BitFaster.Caching/Lfu/Builder/ScopedAsyncConcurrentLfuBuilder.cs
index bd3e0693..e80e329b 100644
--- a/BitFaster.Caching/Lfu/Builder/ScopedAsyncConcurrentLfuBuilder.cs
+++ b/BitFaster.Caching/Lfu/Builder/ScopedAsyncConcurrentLfuBuilder.cs
@@ -1,9 +1,12 @@
 using System;
-using System.Collections.Generic;
-using System.Text;
 
 namespace BitFaster.Caching.Lfu.Builder
 {
+    /// <summary>
+    /// A builder for creating a ConcurrentLfu as IScopedAsyncCache.
+    /// </summary>
+    /// <typeparam name="K">The type of the cache key.</typeparam>
+    /// <typeparam name="V">The type of the cache value.</typeparam>
     public sealed class ScopedAsyncConcurrentLfuBuilder<K, V> : LfuBuilderBase<K, V, ScopedAsyncConcurrentLfuBuilder<K, V>, IScopedAsyncCache<K, V>> where V : IDisposable
     {
         private readonly AsyncConcurrentLfuBuilder<K, Scoped<V>> inner;