document new flag

README.md

@@ -399,6 +399,8 @@ to Miri failing to detect cases of undefined behavior in a program.
 * `-Zmiri-track-weak-memory-loads` shows a backtrace when weak memory emulation returns an outdated
   value from a load. This can help diagnose problems that disappear under
   `-Zmiri-disable-weak-memory-emulation`.
+* `-Zmiri-force-page-size=<num>` overrides the default page size for an architecture, in multiples of 1k.
+  `4` is default for most targets. This value should always be a power of 2 and nonzero.
 
 [function ABI]: https://doc.rust-lang.org/reference/items/functions.html#extern-function-qualifier