diff --git a/README.md b/README.md
index 69b4c3a..2269796 100644
--- a/README.md
+++ b/README.md
@@ -18,5 +18,11 @@ Resources
 * [CH32V003 Datasheet](https://www.wch-ic.com/downloads/CH32V003RM_PDF.html)
 * [QingKeV2 Processor Manual](https://www.wch-ic.com/downloads/QingKeV2_Processor_Manual_PDF.html) — core used in the CH32V003
 
+### Syscalls on RV32E
+
+Consensus seems to be pass the syscall number in `t0`:
+
+* https://github.com/riscvarchive/riscv-qemu/pull/61
+* https://github.com/sysprog21/rv32emu/blob/1286b3c41eec541b68f3d25462722ba848bf4e51/src/syscall.c#L484
 
 [CH32V003]: https://www.wch-ic.com/products/CH32V003.html