1 files changed, 3 insertions, 1 deletions
diff --git a/UefiCpuPkg/Include/Library/CpuPageTableLib.h b/UefiCpuPkg/Include/Library/CpuPageTableLib.h
index cd493ad..e09fa41 100644
--- a/UefiCpuPkg/Include/Library/CpuPageTableLib.h
+++ b/UefiCpuPkg/Include/Library/CpuPageTableLib.h
@@ -81,7 +81,9 @@ typedef enum {
                                  Page table entries that map the linear address range are reset to 0 before set to the new attribute
                                  when a new physical base address is set.
   @param[in]      Mask           The mask used for attribute. The corresponding field in Attribute is ignored if that in Mask is 0.
-  @param[out]     IsModified     TRUE means page table is modified. FALSE means page table is not modified.
+  @param[out]     IsModified     TRUE means page table is modified by software or hardware. FALSE means page table is not modified by software.
+                                 If the output IsModified is FALSE, there is possibility that the page table is changed by hardware. It is ok
+                                 because page table can be changed by hardware anytime, and caller don't need to Flush TLB.
 
   @retval RETURN_UNSUPPORTED        PagingMode is not supported.
   @retval RETURN_INVALID_PARAMETER  PageTable, BufferSize, Attribute or Mask is NULL.