diff --git a/apis/v1alpha1/instrumentation_types.go b/apis/v1alpha1/instrumentation_types.go
index 3cd9c94567..eb7f616387 100644
--- a/apis/v1alpha1/instrumentation_types.go
+++ b/apis/v1alpha1/instrumentation_types.go
@@ -23,6 +23,7 @@ import (
 // InstrumentationSpec defines the desired state of OpenTelemetry SDK and instrumentation.
 type InstrumentationSpec struct {
 	// Selector is the label selector for affected Pods.
+	// This selector only takes effect when annotation: instrumentation.opentelemetry.io/inject-xx equal true.
 	// Unlike standard label selectors, `nil` means `everything`, and this is also the default.
 	// This may change in a future CRD version.
 	// +optional
diff --git a/bundle/manifests/opentelemetry.io_instrumentations.yaml b/bundle/manifests/opentelemetry.io_instrumentations.yaml
index bb0aa1052f..12f825af89 100644
--- a/bundle/manifests/opentelemetry.io_instrumentations.yaml
+++ b/bundle/manifests/opentelemetry.io_instrumentations.yaml
@@ -1677,15 +1677,32 @@ spec:
                     type: string
                 type: object
               selector:
+                description: |-
+                  Selector is the label selector for affected Pods.
+                  This selector only takes effect when annotation: instrumentation.opentelemetry.io/inject-xx equal true.
                 properties:
                   matchExpressions:
+                    description: matchExpressions is a list of label selector requirements.
+                      The requirements are ANDed.
                     items:
+                      description: |-
+                        A label selector requirement is a selector that contains values, a key, and an operator that
+                        relates the key and values.
                       properties:
                         key:
+                          description: key is the label key that the selector applies
+                            to.
                           type: string
                         operator:
+                          description: |-
+                            operator represents a key's relationship to a set of values.
+                            Valid operators are In, NotIn, Exists and DoesNotExist.
                           type: string
                         values:
+                          description: |-
+                            values is an array of string values. If the operator is In or NotIn,
+                            the values array must be non-empty. If the operator is Exists or DoesNotExist,
+                            the values array must be empty.
                           items:
                             type: string
                           type: array
@@ -1697,6 +1714,7 @@ spec:
                   matchLabels:
                     additionalProperties:
                       type: string
+                    description: matchLabels is a map of {key,value} pairs.
                     type: object
                 type: object
                 x-kubernetes-map-type: atomic
diff --git a/config/crd/bases/opentelemetry.io_instrumentations.yaml b/config/crd/bases/opentelemetry.io_instrumentations.yaml
index 068e26f995..3518f67d5f 100644
--- a/config/crd/bases/opentelemetry.io_instrumentations.yaml
+++ b/config/crd/bases/opentelemetry.io_instrumentations.yaml
@@ -1675,15 +1675,32 @@ spec:
                     type: string
                 type: object
               selector:
+                description: |-
+                  Selector is the label selector for affected Pods.
+                  This selector only takes effect when annotation: instrumentation.opentelemetry.io/inject-xx equal true.
                 properties:
                   matchExpressions:
+                    description: matchExpressions is a list of label selector requirements.
+                      The requirements are ANDed.
                     items:
+                      description: |-
+                        A label selector requirement is a selector that contains values, a key, and an operator that
+                        relates the key and values.
                       properties:
                         key:
+                          description: key is the label key that the selector applies
+                            to.
                           type: string
                         operator:
+                          description: |-
+                            operator represents a key's relationship to a set of values.
+                            Valid operators are In, NotIn, Exists and DoesNotExist.
                           type: string
                         values:
+                          description: |-
+                            values is an array of string values. If the operator is In or NotIn,
+                            the values array must be non-empty. If the operator is Exists or DoesNotExist,
+                            the values array must be empty.
                           items:
                             type: string
                           type: array
@@ -1695,6 +1712,7 @@ spec:
                   matchLabels:
                     additionalProperties:
                       type: string
+                    description: matchLabels is a map of {key,value} pairs.
                     type: object
                 type: object
                 x-kubernetes-map-type: atomic
diff --git a/docs/api.md b/docs/api.md
index bf3700cc2c..ddfcbac5c0 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -177,7 +177,8 @@ Enum=tracecontext;baggage;b3;b3multi;jaeger;xray;ottrace;none<br/>
         <td><b><a href="#instrumentationspecselector">selector</a></b></td>
         <td>object</td>
         <td>
-          <br/>
+          Selector is the label selector for affected Pods.
+This selector only takes effect when annotation: instrumentation.opentelemetry.io/inject-xx equal true.<br/>
         </td>
         <td>false</td>
       </tr></tbody>
@@ -3767,7 +3768,8 @@ The value can be for instance parentbased_always_on, parentbased_always_off, par
 
 
 
-
+Selector is the label selector for affected Pods.
+This selector only takes effect when annotation: instrumentation.opentelemetry.io/inject-xx equal true.
 
 <table>
     <thead>
@@ -3782,14 +3784,14 @@ The value can be for instance parentbased_always_on, parentbased_always_off, par
         <td><b><a href="#instrumentationspecselectormatchexpressionsindex">matchExpressions</a></b></td>
         <td>[]object</td>
         <td>
-          <br/>
+          matchExpressions is a list of label selector requirements. The requirements are ANDed.<br/>
         </td>
         <td>false</td>
       </tr><tr>
         <td><b>matchLabels</b></td>
         <td>map[string]string</td>
         <td>
-          <br/>
+          matchLabels is a map of {key,value} pairs.<br/>
         </td>
         <td>false</td>
       </tr></tbody>
@@ -3801,7 +3803,8 @@ The value can be for instance parentbased_always_on, parentbased_always_off, par
 
 
 
-
+A label selector requirement is a selector that contains values, a key, and an operator that
+relates the key and values.
 
 <table>
     <thead>
@@ -3816,21 +3819,24 @@ The value can be for instance parentbased_always_on, parentbased_always_off, par
         <td><b>key</b></td>
         <td>string</td>
         <td>
-          <br/>
+          key is the label key that the selector applies to.<br/>
         </td>
         <td>true</td>
       </tr><tr>
         <td><b>operator</b></td>
         <td>string</td>
         <td>
-          <br/>
+          operator represents a key's relationship to a set of values.
+Valid operators are In, NotIn, Exists and DoesNotExist.<br/>
         </td>
         <td>true</td>
       </tr><tr>
         <td><b>values</b></td>
         <td>[]string</td>
         <td>
-          <br/>
+          values is an array of string values. If the operator is In or NotIn,
+the values array must be non-empty. If the operator is Exists or DoesNotExist,
+the values array must be empty.<br/>
         </td>
         <td>false</td>
       </tr></tbody>