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diff --git a/mlir/docs/Dialects/emitc.md b/mlir/docs/Dialects/emitc.md
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--- a/mlir/docs/Dialects/emitc.md
+++ b/mlir/docs/Dialects/emitc.md
@@ -18,6 +18,8 @@ The following convention is followed:
GCC or Clang.
* If `emitc.array` with a dimension of size zero is used, then the code
requires [a GCC extension](https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html).
+* If `aligned_alloc` is passed to an `emitc.call_opaque` operation, then C++17
+ or C11 is required.
* Else the generated code is compatible with C99.
These restrictions are neither inherent to the EmitC dialect itself nor to the