diff --git a/MdePkg/Include/Library/HobLib.h b/MdePkg/Include/Library/HobLib.h
index 08cb63e936..1590524493 100644
--- a/MdePkg/Include/Library/HobLib.h
+++ b/MdePkg/Include/Library/HobLib.h
@@ -317,6 +317,7 @@ BuildFv2Hob (
   It can only be invoked during PEI phase;
   for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
   
+  If the platform does not support Capsule Volume HOBs, then ASSERT().
   If there is no additional space for HOB creation, then ASSERT().
 
   @param  BaseAddress   The base address of the Capsule Volume.
diff --git a/MdePkg/Library/DxeCoreHobLib/HobLib.c b/MdePkg/Library/DxeCoreHobLib/HobLib.c
index e238aa35db..8bc346e620 100644
--- a/MdePkg/Library/DxeCoreHobLib/HobLib.c
+++ b/MdePkg/Library/DxeCoreHobLib/HobLib.c
@@ -401,6 +401,7 @@ BuildFv2Hob (
   It can only be invoked during PEI phase;
   for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
   
+  If the platform does not support Capsule Volume HOBs, then ASSERT().
   If there is no additional space for HOB creation, then ASSERT().
 
   @param  BaseAddress   The base address of the Capsule Volume.
diff --git a/MdePkg/Library/DxeHobLib/HobLib.c b/MdePkg/Library/DxeHobLib/HobLib.c
index 9d226fa5ee..677f91d06d 100644
--- a/MdePkg/Library/DxeHobLib/HobLib.c
+++ b/MdePkg/Library/DxeHobLib/HobLib.c
@@ -435,6 +435,7 @@ BuildFv2Hob (
   It can only be invoked during PEI phase;
   for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
   
+  If the platform does not support Capsule Volume HOBs, then ASSERT().
   If there is no additional space for HOB creation, then ASSERT().
 
   @param  BaseAddress   The base address of the Capsule Volume.
diff --git a/MdePkg/Library/PeiHobLib/HobLib.c b/MdePkg/Library/PeiHobLib/HobLib.c
index 476ea06dbc..5ffc8549b4 100644
--- a/MdePkg/Library/PeiHobLib/HobLib.c
+++ b/MdePkg/Library/PeiHobLib/HobLib.c
@@ -475,6 +475,7 @@ BuildFv2Hob (
   It can only be invoked during PEI phase;
   for DXE phase, it will ASSERT() since PEI HOB is read-only for DXE phase.
   
+  If the platform does not support Capsule Volume HOBs, then ASSERT().
   If there is no additional space for HOB creation, then ASSERT().
 
   @param  BaseAddress   The base address of the Capsule Volume.