Do the thing

src/registrar/forms/domain_request_wizard.py

@@ -794,6 +794,21 @@ class AnythingElseForm(BaseDeletableRegistrarForm):
     )
 
 
+class PortfolioAnythingElseForm(BaseDeletableRegistrarForm):
+    """The form for the portfolio additional details page. Tied to the anything_else field."""
+    anything_else = forms.CharField(
+        required=False,
+        label="Anything else?",
+        widget=forms.Textarea(),
+        validators=[
+            MaxLengthValidator(
+                2000,
+                message="Response must be less than 2000 characters.",
+            )
+        ],
+    )
+
+
 class AnythingElseYesNoForm(BaseYesNoForm):
     """Yes/no toggle for the anything else question on additional details"""
 

src/registrar/templates/portfolio_domain_request_additional_details.html

@@ -2,18 +2,18 @@
 {% load static field_helpers %}
 
 {% block form_required_fields_help_text %}
-{% include "includes/required_fields.html" %}
+{% comment %} Empty - this step is not required {% endcomment %}
 {% endblock %}
 
 {% block form_fields %}
 
-    <fieldset class="usa-fieldset margin-top-2">          
-            <h2>Is there anything else you’d like us to know about your domain request?</h2> 
+    <fieldset class="usa-fieldset">          
+            <h2 class="margin-top-0 margin-bottom-0">Is there anything else you’d like us to know about your domain request?</h2> 
         </legend>
     </fieldset>
 
-    <div class="margin-top-3" id="anything-else">
-        <p><em>Provide details below. <abbr class="usa-hint usa-hint--required" title="required">*</abbr></em></p>
+    <div id="anything-else">
+        <p><em>This question is optional.</em></p>
         {% with attr_maxlength=2000 add_label_class="usa-sr-only" %}
             {% input_with_errors forms.0.anything_else %}
         {% endwith %}

src/registrar/views/domain_request.py

@@ -614,7 +614,7 @@ class RequestingEntity(DomainRequestWizard):
 class PortfolioAdditionalDetails(DomainRequestWizard):
     template_name = "portfolio_domain_request_additional_details.html"
 
-    forms = [forms.AnythingElseForm]
+    forms = [forms.PortfolioAnythingElseForm]
 
 
 # Non-portfolio pages