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diff --git a/posts/2018-12-02-lime-shapley.md b/posts/2018-12-02-lime-shapley.md
index c9ada5b..233de19 100644
--- a/posts/2018-12-02-lime-shapley.md
+++ b/posts/2018-12-02-lime-shapley.md
@@ -294,6 +294,7 @@ interpretable by themselves.
 One may argue that perhaps we do not need linearity to define $v(S)$ as in (9).
 If we do so, however, then (9) loses mathematical meaning.
 A bigger question is: how effective is SHAP?
+An even bigger question: in general, how do we evaluate models of interpretation?
 
 Evaluating SHAP
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