diff --git a/rattail_tempmon/db/alembic/versions/34041e1032a2_add_client_probe_notes.py b/rattail_tempmon/db/alembic/versions/34041e1032a2_add_client_probe_notes.py
new file mode 100644
index 0000000..3a62edd
--- /dev/null
+++ b/rattail_tempmon/db/alembic/versions/34041e1032a2_add_client_probe_notes.py
@@ -0,0 +1,39 @@
+# -*- coding: utf-8; -*-
+"""add client, probe notes
+
+Revision ID: 34041e1032a2
+Revises: e9eb7fc0a451
+Create Date: 2018-09-28 12:24:11.348627
+
+"""
+
+from __future__ import unicode_literals, absolute_import
+
+# revision identifiers, used by Alembic.
+revision = '34041e1032a2'
+down_revision = u'e9eb7fc0a451'
+branch_labels = None
+depends_on = None
+
+from alembic import op
+import sqlalchemy as sa
+import rattail.db.types
+
+
+
+def upgrade():
+
+    # client
+    op.add_column('client', sa.Column('notes', sa.Text(), nullable=True))
+
+    # probe
+    op.add_column('probe', sa.Column('notes', sa.Text(), nullable=True))
+
+
+def downgrade():
+
+    # probe
+    op.drop_column('probe', 'notes')
+
+    # client
+    op.drop_column('client', 'notes')
diff --git a/rattail_tempmon/db/model.py b/rattail_tempmon/db/model.py
index bf1bfd2..c490f39 100644
--- a/rattail_tempmon/db/model.py
+++ b/rattail_tempmon/db/model.py
@@ -60,6 +60,10 @@ class Client(Base):
     not set, a default of 60 seconds will be assumed.
     """)
 
+    notes = sa.Column(sa.Text(), nullable=True, doc="""
+    Any arbitrary notes for the client.
+    """)
+
     enabled = sa.Column(sa.Boolean(), nullable=False, default=False)
     online = sa.Column(sa.Boolean(), nullable=False, default=False)
 
@@ -117,6 +121,10 @@ class Probe(Base):
     therm_status_timeout = sa.Column(sa.Integer(), nullable=False)
     status_alert_timeout = sa.Column(sa.Integer(), nullable=False)
 
+    notes = sa.Column(sa.Text(), nullable=True, doc="""
+    Any arbitrary notes for the probe.
+    """)
+
     status = sa.Column(sa.Integer(), nullable=True)
     status_changed = sa.Column(sa.DateTime(), nullable=True)
     status_alert_sent = sa.Column(sa.DateTime(), nullable=True)