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-rw-r--r--guides/source/migrations.md8
1 files changed, 4 insertions, 4 deletions
diff --git a/guides/source/migrations.md b/guides/source/migrations.md
index 71a177bca7..5d5c2724b1 100644
--- a/guides/source/migrations.md
+++ b/guides/source/migrations.md
@@ -297,10 +297,10 @@ You can append as many column name/type pairs as you want.
You can also specify some options just after the field type between curly
braces. You can use the following modifiers:
-* `limit` Sets the maximum size of the `string/text/binary/integer` fields
-* `precision` Defines the precision for the `decimal` fields
-* `scale` Defines the scale for the `decimal` fields
-* `polymorphic` Adds a `type` column for `belongs_to` associations
+* `limit` Sets the maximum size of the `string/text/binary/integer` fields.
+* `precision` Defines the precision for the `decimal` fields, representing the total number of digits in the number.
+* `scale` Defines the scale for the `decimal` fields, representing the number of digits after the decimal point.
+* `polymorphic` Adds a `type` column for `belongs_to` associations.
* `null` Allows or disallows `NULL` values in the column.
For instance, running: