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 	also becomes redundant (and is removed a bit later), because immutable
 	memory + pinsyscalls together are cheaper and more effective targetting.
 	Theo de Raadt, Jan 2024.
+    <li><b>-fret-clean</b> is a clang extension that, upon return from a function
+	cleans the return value off the stack (one of many information leaks which
+	can be used to determine where functions in a different DSO reside).
+	The kernel, libc, libcrypto, and ld.so(1) are compile with this option.
+	amd64 only, for now.
 </ul>
 
 <h3>Functions</h3>