diff --git a/netbox/utilities/data.py b/netbox/utilities/data.py
index d2c78f011..7b50d26b8 100644
--- a/netbox/utilities/data.py
+++ b/netbox/utilities/data.py
@@ -162,17 +162,15 @@ def string_to_ranges(value):
     values = []
     for data in value.split(','):
         dash_range = data.strip().split('-')
-        lower, upper = '', ''
         if len(dash_range) == 1 and str(dash_range[0]).isdigit():
-            # Range is only a single value, which is a valid number
+            # Single integer value; expand to a range
             lower = dash_range[0]
             upper = dash_range[0]
         elif len(dash_range) == 2 and str(dash_range[0]).isdigit() and str(dash_range[1]).isdigit():
-            # The range has 2 values and both are valid number
+            # The range has two values and both are valid integers
             lower = dash_range[0]
             upper = dash_range[1]
         else:
             return None
-
         values.append(NumericRange(int(lower), int(upper), bounds='[]'))
     return values
diff --git a/netbox/utilities/forms/fields/array.py b/netbox/utilities/forms/fields/array.py
index 331f69bc7..e4f6c972f 100644
--- a/netbox/utilities/forms/fields/array.py
+++ b/netbox/utilities/forms/fields/array.py
@@ -32,13 +32,14 @@ class NumericArrayField(SimpleArrayField):
 class NumericRangeArrayField(forms.CharField):
     """
     A field which allows for array of numeric ranges:
-      Example: 1-5,7-20,30-50
+      Example: 1-5,10,20-30
     """
     def __init__(self, *args, help_text='', **kwargs):
         if not help_text:
-            example = "<code>1-5,10,20-30</code>"
             help_text = mark_safe(
-                _("Specify one or more individual values or numeric ranges separated by commas. Example: " + example)
+                _(
+                    "Specify one or more individual numbers or numeric ranges separated by commas. Example: {example}"
+                ).format(example="<code>1-5,10,20-30</code>")
             )
         super().__init__(*args, help_text=help_text, **kwargs)
 
diff --git a/netbox/utilities/tests/test_data.py b/netbox/utilities/tests/test_data.py
index e7d86c0fe..7b313baf7 100644
--- a/netbox/utilities/tests/test_data.py
+++ b/netbox/utilities/tests/test_data.py
@@ -78,5 +78,5 @@ class RangeFunctionsTestCase(TestCase):
 
         self.assertEqual(
             string_to_ranges('2-10, a-b'),
-            None    # Fails to convert
+            None  # Fails to convert
         )