diff --git a/config-windows.md b/config-windows.md
index 73a6d639e..516b5850d 100644
--- a/config-windows.md
+++ b/config-windows.md
@@ -82,6 +82,8 @@ The following parameters can be specified (mutually exclusive):
 * **`count`** *(uint64, OPTIONAL)* - specifies the number of CPUs available to the container. It represents the fraction of the configured processor `count` in a container in relation to the processors available in the host. The fraction ultimately determines the portion of processor cycles that the threads in a container can use during each scheduling interval, as the number of cycles per 10,000 cycles.
 * **`shares`** *(uint16, OPTIONAL)* - limits the share of processor time given to the container relative to other workloads on the processor. The processor `shares` (`weight` at the platform level) is a value between 0 and 10,000.
 * **`maximum`** *(uint16, OPTIONAL)* - determines the portion of processor cycles that the threads in a container can use during each scheduling interval, as the number of cycles per 10,000 cycles. Set processor `maximum` to a percentage times 100.
+* **`affinityCPUs`** *(object, OPTIONAL)* - specifies the set of CPU to affinitize for this container.
+* **`affinityPreferredNumaNodes`** *(uint32, OPTIONAL)* - specifies referred set of numa node numbers to affinitize for this container.
 
 Ref: https://docs.microsoft.com/en-us/virtualization/api/hcs/schemareference#Container_Processor
 
diff --git a/specs-go/config.go b/specs-go/config.go
index d1236ba72..a164764f2 100644
--- a/specs-go/config.go
+++ b/specs-go/config.go
@@ -627,6 +627,19 @@ type WindowsCPUResources struct {
 	// cycles per 10,000 cycles. Set processor `maximum` to a percentage times
 	// 100.
 	Maximum *uint16 `json:"maximum,omitempty"`
+	// Set of CPUs to affinitize for this container.
+	AffinityCPUs []WindowsCPUGroupAffinity `json:"affinityCPUs,omitempty"`
+	// Specifies preferred set of numa node numbers to affinitize for this container.
+	AffinityPreferredNumaNodes []uint32 `json:"affinityPreferredNumaNodes,omitempty"`
+}
+
+// Similar to _GROUP_AFFINITY struct defined in
+// https://learn.microsoft.com/en-us/windows-hardware/drivers/ddi/miniport/ns-miniport-_group_affinity
+type WindowsCPUGroupAffinity struct {
+	// CPU mask relative to this CPU group.
+	CPUMask uint64 `json:"cpuMask,omitempty"`
+	// Processor group the mask refers to, as returned by GetLogicalProcessorInformationEx.
+	CPUGroup uint32 `json:"cpuGroup,omitempty"`
 }
 
 // WindowsStorageResources contains storage resource management settings.