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diff --git a/docs/TableGenFundamentals.html b/docs/TableGenFundamentals.html
index ad7263dc00..e9915cb029 100644
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@@ -104,8 +104,10 @@ definition, so the backend can find all definitions of a particular class, such
as "Instruction".</p>
<p><b>TableGen multiclasses</b> are groups of abstract records that are
-instantiated all at once. Each instantiation can result in multiple TableGen
-definitions.</p>
+instantiated all at once. Each instantiation can result in multiple
+TableGen definitions. If a multiclass inherits from another multiclass,
+the definitions in the sub-multiclass become part of the current
+multiclass, as if they were declared in the current multiclass.</p>
</div>