diff --git a/tools/set-import/sets/LICENSE b/tools/set-import/sets/LICENSE
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+This package contains sets imported or generated from the following sources:
+
+- smogon.com/dex: sets from Smogon.com's analyses. These sets are copyrighted by
+  Smogon.com and its contributors and you must receive first receive permission
+  from Smogon.com before using sets from this data source in your application.
+- smogon.com/stats: sets generated based on usage stats from ladder play on the
+  official Pokémon Showdown server.
+- damagecalc.trainertower.com: sets from the VGC 2019: Ultra Series Damage
+  Calculator by Jake White.
+- cantsay.github.io: sets from the Battle Spot Singles Damage Calculator by cant
+  say & LegoFigure11.
+
+The types and loading logic, as well as data from the smogon.com/stats source is
+distributed under the terms of the MIT License.  Other sources of data may be
+subject to additional restrictions and their use should be negotiated beforehand
+with their original authors.