diff --git a/source/docs/v3/tenant-attribute-encryption.blade.md b/source/docs/v3/tenant-attribute-encryption.blade.md
index 8eba1b1..01a00be 100644
--- a/source/docs/v3/tenant-attribute-encryption.blade.md
+++ b/source/docs/v3/tenant-attribute-encryption.blade.md
@@ -10,7 +10,7 @@ To encrypt attributes on the Tenant model, store them in [custom columns]({{ $pa
 
 For example, we'll encrypt the tenant's database credentials – `tenancy_db_username` and `tenancy_db_password`. We need to create custom columns for these attributes, because by default, they are stored in the virtual `data` column.
 
-- Add custom columns to the tenants table (we recommend making the string size at least 512 characters, so the string is capable of containing the encrypted data):
+- Add custom columns to the tenants table (we recommend making the string size at least 512 characters, so the string is capable of containing the encrypted data, they also need to be `nullable` since they are filled after creation):
 
 ```php
 <?php
@@ -32,8 +32,8 @@ class CreateTenantsTable extends Migration
             $table->string('id')->primary();
 
             // Your custom columns
-            $table->string('tenancy_db_username', 512);
-            $table->string('tenancy_db_password', 512);
+            $table->string('tenancy_db_username', 512)->nullable();
+            $table->string('tenancy_db_password', 512)->nullable();
 
             $table->timestamps();
             $table->json('data')->nullable();