diff --git a/atlas/forms.py b/atlas/forms.py
index b193e5f1..3dca8df7 100755
--- a/atlas/forms.py
+++ b/atlas/forms.py
@@ -23,6 +23,7 @@ from tinymce.widgets import TinyMCE
 
 from dal import autocomplete
 
+
 class ExaminationForm(ModelForm):
     class Meta:
         model = Examination
@@ -161,7 +162,7 @@ class CaseForm(ModelForm):
             "description",
             "history",
             "condition",
-            #"differential",
+            # "differential",
             # "sign",
             "open_access",
         ]
@@ -174,7 +175,7 @@ class CaseForm(ModelForm):
             # "mark_scheme": TinyMCE(attrs={"cols": 80, "rows": 30}),
             "description": Textarea(attrs={"cols": 80, "rows": 5}),
             "history": Textarea(attrs={"cols": 80, "rows": 5}),
-            "condition" : autocomplete.ModelSelect2(url='atlas:condition-autocomplete')
+            "condition": autocomplete.ModelSelect2(url="atlas:condition-autocomplete"),
         }
 
     def save(self, commit=True):
@@ -200,12 +201,13 @@ class CaseForm(ModelForm):
 
         return instance
 
+
 CaseDifferentialFormSet = inlineformset_factory(
     Case,
     Differential,
     exclude=[],
     can_delete=True,
-    extra=0,
+    extra=1,
     max_num=10,
 )