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-rw-r--r--doc/mm.md1
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diff --git a/doc/mm.md b/doc/mm.md
index 5e0d2f3b9..97df98bbc 100644
--- a/doc/mm.md
+++ b/doc/mm.md
@@ -52,6 +52,7 @@ where code size matters and you know that your code does not produce cycles, you
 use `--mm:arc`. Notice that the default `async`:idx: implementation produces cycles
 and leaks memory with `--mm:arc`, in other words, for `async` you need to use `--mm:orc`.
 
+Only ARC/ORC support move semantics, destructors, `sink`, `cursor`, `acyclic`.
 
 
 Other MM modes