diff --git a/OvmfPkg/Include/Library/VirtioLib.h b/OvmfPkg/Include/Library/VirtioLib.h
index 3bebd9f2f4..9a502f3e67 100644
--- a/OvmfPkg/Include/Library/VirtioLib.h
+++ b/OvmfPkg/Include/Library/VirtioLib.h
@@ -152,7 +152,7 @@ typedef struct {
 
   The calling driver must be in VSTAT_DRIVER_OK state.
 
-  @param[in out] Ring  The virtio ring we intend to append descriptors to.
+  @param[in,out] Ring  The virtio ring we intend to append descriptors to.
 
   @param[out] Indices  The DESC_INDICES structure to initialize.
 
diff --git a/OvmfPkg/Library/VirtioLib/VirtioLib.c b/OvmfPkg/Library/VirtioLib/VirtioLib.c
index db619eee15..01260b3872 100644
--- a/OvmfPkg/Library/VirtioLib/VirtioLib.c
+++ b/OvmfPkg/Library/VirtioLib/VirtioLib.c
@@ -285,7 +285,7 @@ VirtioRingUninit (
 
   The calling driver must be in VSTAT_DRIVER_OK state.
 
-  @param[in out] Ring  The virtio ring we intend to append descriptors to.
+  @param[in,out] Ring  The virtio ring we intend to append descriptors to.
 
   @param[out] Indices  The DESC_INDICES structure to initialize.