diff --git a/alembic/versions/0ee5a34a1b84_add_extension_to_invites.py b/alembic/versions/0ee5a34a1b84_add_extension_to_invites.py
new file mode 100644
index 00000000..c26faf7c
--- /dev/null
+++ b/alembic/versions/0ee5a34a1b84_add_extension_to_invites.py
@@ -0,0 +1,30 @@
+"""add extension to invites
+
+Revision ID: 0ee5a34a1b84
+Revises: 4a3122ffe898
+Create Date: 2019-09-09 16:16:32.018776
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '0ee5a34a1b84' # pragma: allowlist secret
+down_revision = '4a3122ffe898' # pragma: allowlist secret
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('application_invitations', sa.Column('phone_ext', sa.String(), nullable=True))
+    op.add_column('portfolio_invitations', sa.Column('phone_ext', sa.String(), nullable=True))
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_column('portfolio_invitations', 'phone_ext')
+    op.drop_column('application_invitations', 'phone_ext')
+    # ### end Alembic commands ###
diff --git a/atst/forms/member.py b/atst/forms/member.py
index aca653e5..a97d5852 100644
--- a/atst/forms/member.py
+++ b/atst/forms/member.py
@@ -21,6 +21,7 @@ class NewForm(FlaskForm):
         translate("forms.new_member.phone_number_label"),
         validators=[Optional(), PhoneNumber()],
     )
+    phone_ext = StringField("Extension")
     dod_id = StringField(
         translate("forms.new_member.dod_id_label"),
         validators=[Required(), Length(min=10), IsNumber()],
diff --git a/atst/models/mixins/invites.py b/atst/models/mixins/invites.py
index f6c17f43..69e016f8 100644
--- a/atst/models/mixins/invites.py
+++ b/atst/models/mixins/invites.py
@@ -49,6 +49,7 @@ class InvitesMixin(object):
     first_name = Column(String)
     last_name = Column(String)
     phone_number = Column(String)
+    phone_ext = Column(String)
 
     def __repr__(self):
         role_id = self.role.id if self.role else None