diff --git a/api/v1beta1/virtualdc_types.go b/api/v1beta1/virtualdc_types.go
index f8ed8f7..f0d6a69 100644
--- a/api/v1beta1/virtualdc_types.go
+++ b/api/v1beta1/virtualdc_types.go
@@ -23,21 +23,21 @@ import (
 
 // VirtualDCSpec defines the desired state of VirtualDC
 type VirtualDCSpec struct {
-	// Neco branch is a target branch name for dctest
+	// Neco branch to use for dctest.
 	// If this field is empty, controller runs dctest with "main" branch
 	//+kubebuiler:validation:Optional
 	NecoBranch string `json:"necoBranch,omitempty"`
 
-	// Neco apps branch is a target branch name for dctest
+	// Neco-apps branch to use for dctest.
 	// If this field is empty, controller runs dctest with "main" branch
 	//+kubebuiler:validation:Optional
 	NecoAppsBranch string `json:"necoAppsBranch,omitempty"`
 
-	// Skip bootstrap of neco apps if this is true
+	// Skip bootstrapping neco-apps if true
 	//+kubebuilder:validation:Optional
 	SkipNecoApps bool `json:"skipNecoApps,omitempty"`
 
-	// Command is run after creating dctest pods
+	// Path to a user-defined script and its arguments to run after bootstrapping dctest
 	//+kubebuiler:validation:Optional
 	Command []string `json:"command,omitempty"`
 
diff --git a/config/crd/bases/nyamber.cybozu.io_autovirtualdcs.yaml b/config/crd/bases/nyamber.cybozu.io_autovirtualdcs.yaml
index ca91be2..c5334b7 100644
--- a/config/crd/bases/nyamber.cybozu.io_autovirtualdcs.yaml
+++ b/config/crd/bases/nyamber.cybozu.io_autovirtualdcs.yaml
@@ -65,19 +65,18 @@ spec:
                     description: VirtualDCSpec defines the desired state of VirtualDC
                     properties:
                       command:
-                        description: Command is run after creating dctest pods
+                        description: Path to a user-defined script and its arguments
+                          to run after bootstrapping dctest
                         items:
                           type: string
                         type: array
                       necoAppsBranch:
-                        description: Neco apps branch is a target branch name for
-                          dctest If this field is empty, controller runs dctest with
-                          "main" branch
+                        description: Neco-apps branch to use for dctest. If this field
+                          is empty, controller runs dctest with "main" branch
                         type: string
                       necoBranch:
-                        description: Neco branch is a target branch name for dctest
-                          If this field is empty, controller runs dctest with "main"
-                          branch
+                        description: Neco branch to use for dctest. If this field
+                          is empty, controller runs dctest with "main" branch
                         type: string
                       resources:
                         description: ResourceRequirements describes the compute resource
@@ -130,7 +129,7 @@ spec:
                             type: object
                         type: object
                       skipNecoApps:
-                        description: Skip bootstrap of neco apps if this is true
+                        description: Skip bootstrapping neco-apps if true
                         type: boolean
                     type: object
                   status:
diff --git a/config/crd/bases/nyamber.cybozu.io_virtualdcs.yaml b/config/crd/bases/nyamber.cybozu.io_virtualdcs.yaml
index 8687c77..c6b6879 100644
--- a/config/crd/bases/nyamber.cybozu.io_virtualdcs.yaml
+++ b/config/crd/bases/nyamber.cybozu.io_virtualdcs.yaml
@@ -47,17 +47,18 @@ spec:
             description: VirtualDCSpec defines the desired state of VirtualDC
             properties:
               command:
-                description: Command is run after creating dctest pods
+                description: Path to a user-defined script and its arguments to run
+                  after bootstrapping dctest
                 items:
                   type: string
                 type: array
               necoAppsBranch:
-                description: Neco apps branch is a target branch name for dctest If
-                  this field is empty, controller runs dctest with "main" branch
+                description: Neco-apps branch to use for dctest. If this field is
+                  empty, controller runs dctest with "main" branch
                 type: string
               necoBranch:
-                description: Neco branch is a target branch name for dctest If this
-                  field is empty, controller runs dctest with "main" branch
+                description: Neco branch to use for dctest. If this field is empty,
+                  controller runs dctest with "main" branch
                 type: string
               resources:
                 description: ResourceRequirements describes the compute resource requirements.
@@ -107,7 +108,7 @@ spec:
                     type: object
                 type: object
               skipNecoApps:
-                description: Skip bootstrap of neco apps if this is true
+                description: Skip bootstrapping neco-apps if true
                 type: boolean
             type: object
           status:
diff --git a/docs/crd_virtualdc.md b/docs/crd_virtualdc.md
index 0d3378e..d6ce79c 100644
--- a/docs/crd_virtualdc.md
+++ b/docs/crd_virtualdc.md
@@ -38,10 +38,10 @@ VirtualDCSpec defines the desired state of VirtualDC
 
 | Field | Description | Scheme | Required |
 | ----- | ----------- | ------ | -------- |
-| necoBranch | Neco branch is a target branch name for dctest If this field is empty, controller runs dctest with \"main\" branch | string | false |
-| necoAppsBranch | Neco apps branch is a target branch name for dctest If this field is empty, controller runs dctest with \"main\" branch | string | false |
-| skipNecoApps | Skip bootstrap of neco apps if this is true | bool | false |
-| command | Command is run after creating dctest pods | []string | false |
+| necoBranch | Neco branch to use for dctest. If this field is empty, controller runs dctest with \"main\" branch | string | false |
+| necoAppsBranch | Neco-apps branch to use for dctest. If this field is empty, controller runs dctest with \"main\" branch | string | false |
+| skipNecoApps | Skip bootstrapping neco-apps if true | bool | false |
+| command | Path to a user-defined script and its arguments to run after bootstrapping dctest | []string | false |
 | resources |  | corev1.ResourceRequirements | false |
 
 [Back to Custom Resources](#custom-resources)