diff --git a/Documentation/arch/riscv/uabi.rst b/Documentation/arch/riscv/uabi.rst
index 243e40062e34..0c5299e00762 100644
--- a/Documentation/arch/riscv/uabi.rst
+++ b/Documentation/arch/riscv/uabi.rst
@@ -7,7 +7,9 @@ ISA string ordering in /proc/cpuinfo
 ------------------------------------
 
 The canonical order of ISA extension names in the ISA string is defined in
-chapter 27 of the unprivileged specification.
+Chapter 27 of the RISC-V Instruction Set Manual Volume I Unprivileged ISA
+(Document Version 20191213).
+
 The specification uses vague wording, such as should, when it comes to ordering,
 so for our purposes the following rules apply: