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@@ -347,6 +347,9 @@ complete list.
 Define                   Effect
 ======================   =========================================================
 ``release``              Turns off runtime checks and turns on the optimizer.
+                         More aggressive optimizations are possible, eg:
+                         ``--passC:-ffast-math`` (but see issue #10305)
+                         ``--stacktrace:off``
 ``useWinAnsi``           Modules like ``os`` and ``osproc`` use the Ansi versions
                          of the Windows API. The default build uses the Unicode
                          version.