diff --git a/aiohttp_admin/backends/sqlalchemy.py b/aiohttp_admin/backends/sqlalchemy.py
index d00f453d..a9093646 100644
--- a/aiohttp_admin/backends/sqlalchemy.py
+++ b/aiohttp_admin/backends/sqlalchemy.py
@@ -177,15 +177,24 @@ def __init__(self, db: AsyncEngine, model_or_table: Union[sa.Table, type[Declara
                                          "target": key.column.name}
             else:
                 field, inp, props = get_components(c.type)
-            props["source"] = c.name
 
+            props["source"] = c.name
             if isinstance(c.type, sa.Enum):
                 props["choices"] = tuple({"id": e.value, "name": e.name}
                                          for e in c.type.python_type)
 
+            length = getattr(c.type, "length", 0)
+            if length is None or length > 31:
+                props["fullWidth"] = True
+                if length is None or length > 127:
+                    props["multiline"] = True
+
             if isinstance(c.default, sa.ColumnDefault):
                 props["placeholder"] = c.default.arg
 
+            if c.comment:
+                props["helperText"] = c.comment
+
             self.fields[c.name] = comp(field, props)
             if c.computed is None:
                 # TODO: Allow custom props (e.g. disabled, multiline, rows etc.)
diff --git a/tests/test_backends_sqlalchemy.py b/tests/test_backends_sqlalchemy.py
index ea196880..e3726646 100644
--- a/tests/test_backends_sqlalchemy.py
+++ b/tests/test_backends_sqlalchemy.py
@@ -35,12 +35,15 @@ class TestModel(base):  # type: ignore[misc,valid-type]
     assert r.name == "dummy"
     assert r.primary_key == "id"
     assert r.fields == {"id": comp("NumberField", {"source": "id"}),
-                        "num": comp("TextField", {"source": "num"})}
+                        "num": comp("TextField", {"source": "num", "fullWidth": True,
+                                                  "multiline": True})}
     # Autoincremented PK should not be in create form
     assert r.inputs == {
         "id": comp("NumberInput", {"source": "id", "validate": [func("required", ())]})
         | {"show_create": False},
-        "num": comp("TextInput", {"source": "num", "validate": [func("required", ())]})
+        "num": comp("TextInput", {
+            "source": "num", "fullWidth": True, "multiline": True,
+            "validate": [func("required", ())]})
         | {"show_create": True}
     }
 
@@ -66,6 +69,21 @@ def test_table(mock_engine: AsyncEngine) -> None:
     }
 
 
+def test_extra_props(base: type[DeclarativeBase], mock_engine: AsyncEngine) -> None:
+    class TestModel(base):  # type: ignore[misc,valid-type]
+        __tablename__ = "dummy"
+        id: Mapped[int] = mapped_column(primary_key=True)
+        num: Mapped[str] = mapped_column(sa.String(128), comment="Foo", default="Bar")
+
+    r = SAResource(mock_engine, TestModel)
+    assert r.fields["num"]["props"] == {
+        "source": "num", "fullWidth": True, "multiline": True, "placeholder": "Bar",
+        "helperText": "Foo"}
+    assert r.inputs["num"]["props"] == {
+        "source": "num", "fullWidth": True, "multiline": True, "placeholder": "Bar",
+        "helperText": "Foo", "validate": [func("maxLength", (128,))]}
+
+
 async def test_binary(
     base: DeclarativeBase, aiohttp_client: Callable[[web.Application], Awaitable[TestClient]],
     login: _Login
@@ -243,19 +261,21 @@ async def test_nonid_pk(base: type[DeclarativeBase], mock_engine: AsyncEngine) -
     class TestModel(base):  # type: ignore[misc,valid-type]
         __tablename__ = "test"
         num: Mapped[int] = mapped_column(primary_key=True)
-        other: Mapped[str]
+        other: Mapped[str] = mapped_column(sa.String(64))
 
     r = SAResource(mock_engine, TestModel)
     assert r.name == "test"
     assert r.primary_key == "num"
     assert r.fields == {
         "num": comp("NumberField", {"source": "num"}),
-        "other": comp("TextField", {"source": "other"})
+        "other": comp("TextField", {"source": "other", "fullWidth": True})
     }
     assert r.inputs == {
         "num": comp("NumberInput", {"source": "num", "validate": [func("required", ())]})
         | {"show_create": False},
-        "other": comp("TextInput", {"source": "other", "validate": [func("required", ())]})
+        "other": comp("TextInput", {
+            "fullWidth": True, "source": "other",
+            "validate": [func("required", ()), func("maxLength", (64,))]})
         | {"show_create": True}
     }