--- a/doc/manual/callconvs/callconv_arm64.tex	Wed Mar 23 15:33:09 2022 +0100
+++ b/doc/manual/callconvs/callconv_arm64.tex	Mon Apr 04 15:50:52 2022 +0200
@@ -79,6 +79,7 @@
 and 8 floating-point registers to a reserved stack area adjacent to the other parameters on the stack (only the unnamed integer parameters require saving, though)
 \item aggregates (struct, union) with 1 to 4 identical floating-point members (either float or double) are passed field-by-field (8-byte aligned if passed via stack), except if passed as a vararg
 \item other aggregates (struct, union) \textgreater\ 16 bytes in size are passed indirectly, as a pointer to a copy (if needed)
+\item {\it non-trivial} C++ aggregates (as defined by the language) of any size, are passed indirectly via a pointer to a copy of the aggregate
 \item all other aggregates (struct, union), after rounding up the size to the nearest multiple of 8, are passed as a sequence of dwords, like integers
 \item aggregates are never split across registers and stack, so if not enough registers are available an aggregated is passed via the stack (for aggregates that
 would've been passed as floating point values, any still unused float registers will be skipped for any subsequent arg)
@@ -90,6 +91,7 @@
 \begin{itemize}
 \item integer return values use x0
 \item floating-point return values use d0
+\item for {\it non-trivial} C++ aggregates, the caller allocates space, passes pointer to it to the callee via x8, and callee writes return value to this space; the ptr to the aggregate is returned in x0
 \item aggregates (struct, union) that would be passed via registers if passed as a first param, are returned via those registers
 \item for aggregates not returnable via registers (e.g. if regs exhausted, or \textgreater\ 16b, ...), the caller allocates space, passes pointer to it to the callee through
 x8, and callee writes return value to this space (note that this is not a hidden first param, as x8 is not used for passing params); the ptr to the aggregate is returned in x0