diff --git a/Documentation/riscv/index.rst b/Documentation/riscv/index.rst
index e23b876ad6eb..2e5b18fbb145 100644
--- a/Documentation/riscv/index.rst
+++ b/Documentation/riscv/index.rst
@@ -8,6 +8,7 @@ RISC-V architecture
     boot-image-header
     vm-layout
     patch-acceptance
+    uabi
 
     features
 
diff --git a/Documentation/riscv/uabi.rst b/Documentation/riscv/uabi.rst
new file mode 100644
index 000000000000..21a82cfb6c4d
--- /dev/null
+++ b/Documentation/riscv/uabi.rst
@@ -0,0 +1,6 @@
+.. SPDX-License-Identifier: GPL-2.0
+
+RISC-V Linux User ABI
+=====================
+
+Misaligned accesses are supported in userspace, but they may perform poorly.