diff --git a/src/memory/FrameAllocator.hh b/src/memory/FrameAllocator.hh
index ad6c200..ca74895 100644
--- a/src/memory/FrameAllocator.hh
+++ b/src/memory/FrameAllocator.hh
@@ -16,6 +16,10 @@
 
 namespace kernel {
 
+/**
+ * Handles allocating page frames. Frames are chunks of physical memory into
+ * which pages may be allocated.
+ */
 struct FrameAllocator
 {
     FrameAllocator();
@@ -28,6 +32,8 @@ struct FrameAllocator
      */
     void* allocate();
 
+    // TODO: free()
+
 private:
     typedef kstd::Bitmap<u8> Bitmap;