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-rw-r--r--include/framework/structure/InternalLevel.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/framework/structure/InternalLevel.h b/include/framework/structure/InternalLevel.h
index d586869..db38946 100644
--- a/include/framework/structure/InternalLevel.h
+++ b/include/framework/structure/InternalLevel.h
@@ -6,6 +6,12 @@
*
* Distributed under the Modified BSD License.
*
+ * The word `Internal` in this class's name refers to memory. The current
+ * model, inherited from the framework in Practical Dynamic Extension for
+ * Sampling Indexes, would use a different ExternalLevel for shards stored
+ * on external storage. This is a distinction that can probably be avoided
+ * with some more thought being put into interface design.
+ *
*/
#pragma once