diff --git a/src/synapse_registration/registration/forms.py b/src/synapse_registration/registration/forms.py
index 8f3890c..a35460d 100644
--- a/src/synapse_registration/registration/forms.py
+++ b/src/synapse_registration/registration/forms.py
@@ -32,6 +32,7 @@ class RegistrationForm(forms.Form):
         )
     )
     registration_reason = forms.CharField(
+        min_length=30,
         widget=forms.Textarea(
             attrs={
                 "class": "textarea",