diff --git a/src/mscorlib/src/System/Collections/Generic/List.cs b/src/mscorlib/src/System/Collections/Generic/List.cs
index 6eeda8df078c..e5365947a81b 100644
--- a/src/mscorlib/src/System/Collections/Generic/List.cs
+++ b/src/mscorlib/src/System/Collections/Generic/List.cs
@@ -220,6 +220,7 @@ public void Add(T item)
             }
         }
 
+        // Separated out of List.Add to improve inlinability of both functions
         private void AddWithoutResize(T item)
         {
             var size = _size;
@@ -228,6 +229,7 @@ private void AddWithoutResize(T item)
             _items[size] = item;
         }
 
+        // Non-inline from List.Add to improve its code quality as uncommon path
         [MethodImpl(MethodImplOptions.NoInlining)]
         private void AddWithResize(T item)
         {