diff --git a/config/crds/resources/apiextensions.k8s.io_v1_customresourcedefinition_computeinstances.compute.cnrm.cloud.google.com.yaml b/config/crds/resources/apiextensions.k8s.io_v1_customresourcedefinition_computeinstances.compute.cnrm.cloud.google.com.yaml
index 49c9ae630e..1f931b929f 100644
--- a/config/crds/resources/apiextensions.k8s.io_v1_customresourcedefinition_computeinstances.compute.cnrm.cloud.google.com.yaml
+++ b/config/crds/resources/apiextensions.k8s.io_v1_customresourcedefinition_computeinstances.compute.cnrm.cloud.google.com.yaml
@@ -272,6 +272,8 @@ spec:
                         description: Immutable. The size of the image in gigabytes.
                         type: integer
                       sourceImageRef:
+                        description: Immutable. The image from which to initialize
+                          this disk.
                         oneOf:
                         - not:
                             required:
@@ -335,6 +337,7 @@ spec:
                       or "READ_WRITE".
                     type: string
                   sourceDiskRef:
+                    description: Immutable. The source disk used to create this disk.
                     oneOf:
                     - not:
                         required:
diff --git a/config/servicemappings/compute.yaml b/config/servicemappings/compute.yaml
index 5369f69f7a..43bb889e92 100644
--- a/config/servicemappings/compute.yaml
+++ b/config/servicemappings/compute.yaml
@@ -830,6 +830,8 @@ spec:
           targetField: self_link
         - key: sourceDiskRef
           tfField: boot_disk.source
+          description: |-
+            Immutable. The source disk used to create this disk.
           gvk:
             kind: ComputeDisk
             version: v1beta1
@@ -837,6 +839,8 @@ spec:
           targetField: self_link
         - key: sourceImageRef # prefix with "source" as that's how it is in the underlying API
           tfField: boot_disk.initialize_params.image
+          description: |-
+            Immutable. The image from which to initialize this disk.
           gvk:
             kind: ComputeImage
             version: v1beta1
@@ -933,6 +937,8 @@ spec:
           targetField: self_link
         - key: sourceDiskRef
           tfField: boot_disk.source
+          description: |-
+            Immutable. The source disk used to create this disk.
           gvk:
             kind: ComputeDisk
             version: v1beta1
@@ -940,6 +946,8 @@ spec:
           targetField: self_link
         - key: sourceImageRef # prefix with "source" as that's how it is in the underlying API
           tfField: boot_disk.initialize_params.image
+          description: |-
+            Immutable. The image from which to initialize this disk.
           gvk:
             kind: ComputeImage
             version: v1beta1
diff --git a/pkg/clients/generated/apis/compute/v1beta1/computeinstance_types.go b/pkg/clients/generated/apis/compute/v1beta1/computeinstance_types.go
index b30b3b5ec7..344301ddd8 100644
--- a/pkg/clients/generated/apis/compute/v1beta1/computeinstance_types.go
+++ b/pkg/clients/generated/apis/compute/v1beta1/computeinstance_types.go
@@ -122,6 +122,7 @@ type InstanceBootDisk struct {
 	// +optional
 	Mode *string `json:"mode,omitempty"`
 
+	/* Immutable. The source disk used to create this disk. */
 	// +optional
 	SourceDiskRef *v1alpha1.ResourceRef `json:"sourceDiskRef,omitempty"`
 }
@@ -158,6 +159,7 @@ type InstanceInitializeParams struct {
 	// +optional
 	Size *int `json:"size,omitempty"`
 
+	/* Immutable. The image from which to initialize this disk. */
 	// +optional
 	SourceImageRef *v1alpha1.ResourceRef `json:"sourceImageRef,omitempty"`
 
diff --git a/scripts/generate-google3-docs/resource-reference/generated/resource-docs/compute/computeinstance.md b/scripts/generate-google3-docs/resource-reference/generated/resource-docs/compute/computeinstance.md
index 7e1f2d4b9a..c5a40db9fe 100644
--- a/scripts/generate-google3-docs/resource-reference/generated/resource-docs/compute/computeinstance.md
+++ b/scripts/generate-google3-docs/resource-reference/generated/resource-docs/compute/computeinstance.md
@@ -626,7 +626,7 @@ zone: string
         </td>
         <td>
             <p><code class="apitype">object</code></p>
-            <p>{% verbatim %}{% endverbatim %}</p>
+            <p>{% verbatim %}Immutable. The image from which to initialize this disk.{% endverbatim %}</p>
         </td>
     </tr>
     <tr>
@@ -726,7 +726,7 @@ zone: string
         </td>
         <td>
             <p><code class="apitype">object</code></p>
-            <p>{% verbatim %}{% endverbatim %}</p>
+            <p>{% verbatim %}Immutable. The source disk used to create this disk.{% endverbatim %}</p>
         </td>
     </tr>
     <tr>