diff --git a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.uni b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.uni
index 0762eeba53..de2fb41067 100644
--- a/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.uni
+++ b/ShellPkg/Library/UefiShellAcpiViewCommandLib/UefiShellAcpiViewCommandLib.uni
@@ -74,10 +74,15 @@
 "  1. The AcpiTable parameter can match any installed table type.\r\n"
 "     Tables without specific handling will be displayed as a raw hex dump (or\r\n"
 "     dumped to a file if -d is used).\r\n"
-"  2. Formatted display and checking is provided for these signature types:\r\n"
+"  2. -s option supports to display the specified AcpiTable type that is present\r\n"
+"     in the system. For normal type AcpiTable, it would display the data of the\r\n"
+"     AcpiTable and AcpiTable header. The following type may contain header type\r\n"
+"     other than AcpiTable header. The actual header can refer to the ACPI spec 6.2\r\n"
+"     Extra A. Particular types:\r\n"
 "       APIC  - Multiple APIC Description Table (MADT)\r\n"
 "       BGRT  - Boot Graphics Resource Table\r\n"
 "       DBG2  - Debug Port Table 2\r\n"
+"       DSDT  - Differentiated System Description Table\r\n"
 "       FACP  - Fixed ACPI Description Table (FADT)\r\n"
 "       GTDT  - Generic Timer Description Table\r\n"
 "       IORT  - IO Remapping Table\r\n"
@@ -87,6 +92,7 @@
 "       SLIT  - System Locality Information Table\r\n"
 "       SPCR  - Serial Port Console Redirection Table\r\n"
 "       SRAT  - System Resource Affinity Table\r\n"
+"       SSDT  - Secondary SystemDescription Table\r\n"
 "       XSDT  - Extended System Description Table\r\n"
 " \r\n"
 ".SH STANDARDS\r\n"