diff --git a/docs/ref/forms/fields.txt b/docs/ref/forms/fields.txt
index 8f1de1f22b..39b0c17bc1 100644
--- a/docs/ref/forms/fields.txt
+++ b/docs/ref/forms/fields.txt
@@ -463,7 +463,8 @@ Takes four optional arguments:
 .. attribute:: DecimalField.max_value
 .. attribute:: DecimalField.min_value
 
-    These attributes define the limits for the fields value.
+    These control the range of values permitted in the field, and should be
+    given as ``decimal.Decimal`` values.
 
 .. attribute:: DecimalField.max_digits