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-rw-r--r--guides/source/migrations.md1
1 files changed, 1 insertions, 0 deletions
diff --git a/guides/source/migrations.md b/guides/source/migrations.md
index 3c512e0390..1c858069f3 100644
--- a/guides/source/migrations.md
+++ b/guides/source/migrations.md
@@ -301,6 +301,7 @@ braces. You can use the following modifiers:
* `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
+* `null` Allows or disallows `NULL` values in the column.
For instance, running