diff --git a/doc/developer-guides/hld/hld-emulated-devices.rst b/doc/developer-guides/hld/hld-emulated-devices.rst
index 7f14152aa..5217b3592 100644
--- a/doc/developer-guides/hld/hld-emulated-devices.rst
+++ b/doc/developer-guides/hld/hld-emulated-devices.rst
@@ -17,3 +17,4 @@ documented in this section.
    AHCI virtualization <ahci-hld>
    GVT-g GPU Virtualization <hld-APL_GVT-g>
    UART emulation in hypervisor <vuart-virt-hld>
+   RTC emulation in hypervisor <rtc-virt-hld>
diff --git a/doc/developer-guides/hld/rtc-virt-hld.rst b/doc/developer-guides/hld/rtc-virt-hld.rst
new file mode 100644
index 000000000..7275bc98f
--- /dev/null
+++ b/doc/developer-guides/hld/rtc-virt-hld.rst
@@ -0,0 +1,9 @@
+.. _rtc-virt-hld:
+
+RTC Virtualization
+##################
+
+This document describes the RTC virtualization implementation in
+ACRN device model.
+
+vRTC is a read-only RTC for For pre-launched VM, Service OS and post-launched RT VM. It supports RW for CMOS address port 0x70 and RO for CMOS data port 0x71. Reads to CMOS RAM offsets are fetched by reading CMOS h/w directly and writes to CMOS offsets are discarded.