diff --git a/CHANGELOG.md b/CHANGELOG.md
index 58cac74b..cc4c2725 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -17,6 +17,8 @@
   the cluster nodes
 - Add `OpenSearch` field `userConfig.opensearch.segrep`, type `object`: Segment Replication Backpressure
   Settings
+- Add `Flink` field `userConfig.custom_code`, type `boolean`: Enable to upload Custom JARs for Flink
+  applications
 
 ## v0.26.0 - 2024-11-21
 
diff --git a/api/v1alpha1/userconfig/service/flink/flink.go b/api/v1alpha1/userconfig/service/flink/flink.go
index 3b0dd36a..74c37786 100644
--- a/api/v1alpha1/userconfig/service/flink/flink.go
+++ b/api/v1alpha1/userconfig/service/flink/flink.go
@@ -34,6 +34,9 @@ type FlinkUserConfig struct {
 	// Deprecated. Additional Cloud Regions for Backup Replication
 	AdditionalBackupRegions []string `groups:"create,update" json:"additional_backup_regions,omitempty"`
 
+	// Enable to upload Custom JARs for Flink applications
+	CustomCode *bool `groups:"create,update" json:"custom_code,omitempty"`
+
 	// +kubebuilder:validation:Enum="1.19";"1.20"
 	// +kubebuilder:validation:XValidation:rule="self == oldSelf",message="Value is immutable"
 	// Flink major version
diff --git a/api/v1alpha1/userconfig/service/flink/zz_generated.deepcopy.go b/api/v1alpha1/userconfig/service/flink/zz_generated.deepcopy.go
index d4428ab3..73557ce7 100644
--- a/api/v1alpha1/userconfig/service/flink/zz_generated.deepcopy.go
+++ b/api/v1alpha1/userconfig/service/flink/zz_generated.deepcopy.go
@@ -14,6 +14,11 @@ func (in *FlinkUserConfig) DeepCopyInto(out *FlinkUserConfig) {
 		*out = make([]string, len(*in))
 		copy(*out, *in)
 	}
+	if in.CustomCode != nil {
+		in, out := &in.CustomCode, &out.CustomCode
+		*out = new(bool)
+		**out = **in
+	}
 	if in.FlinkVersion != nil {
 		in, out := &in.FlinkVersion, &out.FlinkVersion
 		*out = new(string)
diff --git a/charts/aiven-operator-crds/templates/aiven.io_flinks.yaml b/charts/aiven-operator-crds/templates/aiven.io_flinks.yaml
index f669ff35..c1a3ae76 100644
--- a/charts/aiven-operator-crds/templates/aiven.io_flinks.yaml
+++ b/charts/aiven-operator-crds/templates/aiven.io_flinks.yaml
@@ -230,6 +230,9 @@ spec:
                         type: string
                       maxItems: 1
                       type: array
+                    custom_code:
+                      description: Enable to upload Custom JARs for Flink applications
+                      type: boolean
                     flink_version:
                       description: Flink major version
                       enum:
diff --git a/config/crd/bases/aiven.io_flinks.yaml b/config/crd/bases/aiven.io_flinks.yaml
index f669ff35..c1a3ae76 100644
--- a/config/crd/bases/aiven.io_flinks.yaml
+++ b/config/crd/bases/aiven.io_flinks.yaml
@@ -230,6 +230,9 @@ spec:
                         type: string
                       maxItems: 1
                       type: array
+                    custom_code:
+                      description: Enable to upload Custom JARs for Flink applications
+                      type: boolean
                     flink_version:
                       description: Flink major version
                       enum:
diff --git a/docs/docs/api-reference/flink.md b/docs/docs/api-reference/flink.md
index 57be84af..c17bfde0 100644
--- a/docs/docs/api-reference/flink.md
+++ b/docs/docs/api-reference/flink.md
@@ -200,6 +200,7 @@ Cassandra specific user configuration options.
 **Optional**
 
 - [`additional_backup_regions`](#spec.userConfig.additional_backup_regions-property){: name='spec.userConfig.additional_backup_regions-property'} (array of strings, MaxItems: 1). Deprecated. Additional Cloud Regions for Backup Replication.
+- [`custom_code`](#spec.userConfig.custom_code-property){: name='spec.userConfig.custom_code-property'} (boolean). Enable to upload Custom JARs for Flink applications.
 - [`flink_version`](#spec.userConfig.flink_version-property){: name='spec.userConfig.flink_version-property'} (string, Enum: `1.19`, `1.20`, Immutable). Flink major version.
 - [`ip_filter`](#spec.userConfig.ip_filter-property){: name='spec.userConfig.ip_filter-property'} (array of objects, MaxItems: 1024). Allow incoming connections from CIDR address block, e.g. `10.20.0.0/16`. See below for [nested schema](#spec.userConfig.ip_filter).
 - [`number_of_task_slots`](#spec.userConfig.number_of_task_slots-property){: name='spec.userConfig.number_of_task_slots-property'} (integer, Minimum: 1, Maximum: 1024). Task slots per node. For a 3 node plan, total number of task slots is 3x this value.