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diff --git a/IDEAS.md b/IDEAS.md
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--- a/IDEAS.md
+++ b/IDEAS.md
@@ -33,3 +33,7 @@ Ideas
   some point
 * I'd like a Git hook that pre-fills out "Version X.Y.Z" if making an annotated
   tag named `vX.Y.Z`.
+* I'd like to make the zG command in Vim a bit more useful by maintaining
+  a per-file cache of added words, indexed by path, mapping it to 2zg or 3zg
+  rather like Steve Losh does.  I wouldn't think it would be too hard;
+  'spellfile' is a buffer-local option.