diff --git a/README.md b/README.md
index 69ab2bc5..f22c9ec7 100644
--- a/README.md
+++ b/README.md
@@ -538,7 +538,7 @@ export class CrewMemberComponent extends NgxSubFormComponent<CrewMember> {
 
 **Hooks**
 
-- `onFormUpdate`: Allows you to react whenever the form is being modified. Instead of subscribing to `this.formGroup.valueChanges` or `this.formControls.someProp.valueChanges` you will not have to deal with anything asynchronous nor have to worry about subscriptions and memory leaks. Just implement the method `onFormUpdate(formUpdate: FormUpdate<FormInterface>): void` and if you need to know which property changed do a check like the following: `if (formUpdate.yourProperty) {}`. Be aware that this method will be called only when there are either local changes to the form or changes coming from subforms. If the parent `setValue` or `patchValue` this method won't be triggered
+- `onFormUpdate` [**_deprecated_**]: Allows you to react whenever the form is being modified. Instead of subscribing to `this.formGroup.valueChanges` or `this.formControls.someProp.valueChanges` you will not have to deal with anything asynchronous nor have to worry about subscriptions and memory leaks. Just implement the method `onFormUpdate(formUpdate: FormUpdate<FormInterface>): void` and if you need to know which property changed do a check like the following: `if (formUpdate.yourProperty) {}`. Be aware that this method will be called only when there are either local changes to the form or changes coming from subforms. If the parent `setValue` or `patchValue` this method won't be triggered
 - `getFormGroupControlOptions`: Allows you to define control options for construction of the internal FormGroup. Use this to define form-level validators
 - `createFormArrayControl`: Allows you to create the `FormControl` of a given property of your form (to define validators for example). When you want to use this hook, implement the following interface `NgxFormWithArrayControls`
 - `handleEmissionRate`: Allows you to define a custom emission rate (top level or any sub level)
diff --git a/projects/ngx-sub-form/src/lib/ngx-sub-form.types.ts b/projects/ngx-sub-form/src/lib/ngx-sub-form.types.ts
index 71f4b967..81c7661f 100644
--- a/projects/ngx-sub-form/src/lib/ngx-sub-form.types.ts
+++ b/projects/ngx-sub-form/src/lib/ngx-sub-form.types.ts
@@ -2,7 +2,9 @@ import { FormControl, FormGroup, ValidationErrors } from '@angular/forms';
 import { Observable } from 'rxjs';
 import { ArrayPropertyKey, ArrayPropertyValue, Controls, FormUpdate } from './ngx-sub-form-utils';
 
+// @deprecated
 export interface OnFormUpdate<FormInterface> {
+  // @deprecated
   onFormUpdate?: (formUpdate: FormUpdate<FormInterface>) => void;
 }