diff --git a/projects/nat-archive-tool/src/nat/System.kiss b/projects/nat-archive-tool/src/nat/System.kiss
index bbb37988..7f2bd3a9 100644
--- a/projects/nat-archive-tool/src/nat/System.kiss
+++ b/projects/nat-archive-tool/src/nat/System.kiss
@@ -13,3 +13,5 @@
     (if (canProcessEntry archive e)
             (dictSet entries e.id e)
         (entries.remove e.id)))
+
+// TODO systems may need access to a UI
diff --git a/projects/nat-archive-tool/src/nat/systems/MediaWikiSystem.hx b/projects/nat-archive-tool/src/nat/systems/MediaWikiSystem.hx
index f66e37c6..fded09f2 100644
--- a/projects/nat-archive-tool/src/nat/systems/MediaWikiSystem.hx
+++ b/projects/nat-archive-tool/src/nat/systems/MediaWikiSystem.hx
@@ -5,5 +5,8 @@ import kiss.List;
 import nat.System;
 import haxe.Json;
 
+/**
+ * Base System that processes Entries using the HTTP API for any wiki built with MediaWiki
+ */
 @:build(kiss.Kiss.build())
 class MediaWikiSystem extends System {}
diff --git a/projects/nat-archive-tool/src/nat/systems/WikipediaImageSystem.hx b/projects/nat-archive-tool/src/nat/systems/WikipediaImageSystem.hx
index 7048a5f7..9789e919 100644
--- a/projects/nat-archive-tool/src/nat/systems/WikipediaImageSystem.hx
+++ b/projects/nat-archive-tool/src/nat/systems/WikipediaImageSystem.hx
@@ -6,5 +6,8 @@ import kiss.Prelude;
 using haxe.io.Path;
 using StringTools;
 
+/**
+ * System which downloads and attaches images from Wikipedia pages that match Entries' names. 
+ */
 @:build(kiss.Kiss.build())
 class WikipediaImageSystem extends MediaWikiSystem {}