diff --git a/.idea/libraries/Dart_Packages.xml b/.idea/libraries/Dart_Packages.xml
index 6ad1fb87..7d869b7a 100644
--- a/.idea/libraries/Dart_Packages.xml
+++ b/.idea/libraries/Dart_Packages.xml
@@ -44,6 +44,7 @@
           <value>
             <list>
               <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build-1.1.0/lib" />
+              <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build-1.1.1/lib" />
             </list>
           </value>
         </entry>
@@ -58,6 +59,7 @@
           <value>
             <list>
               <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_daemon-0.2.3/lib" />
+              <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_daemon-0.4.0/lib" />
             </list>
           </value>
         </entry>
@@ -65,6 +67,7 @@
           <value>
             <list>
               <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_resolvers-0.2.3/lib" />
+              <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_resolvers-1.0.3/lib" />
             </list>
           </value>
         </entry>
@@ -72,6 +75,7 @@
           <value>
             <list>
               <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner-1.2.3/lib" />
+              <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner-1.2.6/lib" />
             </list>
           </value>
         </entry>
@@ -79,6 +83,7 @@
           <value>
             <list>
               <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner_core-2.0.1/lib" />
+              <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner_core-2.0.3/lib" />
             </list>
           </value>
         </entry>
@@ -489,6 +494,7 @@
           <value>
             <list>
               <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/stream_transform-0.0.14+1/lib" />
+              <option value="$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/stream_transform-0.0.15/lib" />
             </list>
           </value>
         </entry>
@@ -604,11 +610,16 @@
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/async-2.0.8/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/boolean_selector-1.0.4/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build-1.1.0/lib" />
+      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build-1.1.1/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_config-0.3.1+4/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_daemon-0.2.3/lib" />
+      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_daemon-0.4.0/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_resolvers-0.2.3/lib" />
+      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_resolvers-1.0.3/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner-1.2.3/lib" />
+      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner-1.2.6/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner_core-2.0.1/lib" />
+      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_runner_core-2.0.3/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/build_test-0.10.6/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/built_collection-4.1.0/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/built_value-6.3.0/lib" />
@@ -664,6 +675,7 @@
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/stack_trace-1.9.3/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/stream_channel-1.6.8/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/stream_transform-0.0.14+1/lib" />
+      <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/stream_transform-0.0.15/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/string_scanner-1.0.4/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/term_glyph-1.1.0/lib" />
       <root url="file://$USER_HOME$/.pub-cache/hosted/pub.dartlang.org/test-1.5.3/lib" />
diff --git a/sally/lib/src/dsl/columns.dart b/sally/lib/src/dsl/columns.dart
index 280ef6af..86230358 100644
--- a/sally/lib/src/dsl/columns.dart
+++ b/sally/lib/src/dsl/columns.dart
@@ -27,6 +27,10 @@ class ColumnBuilder<Builder, ResultColumn> {
   Builder named(String name) => null;
   Builder primaryKey() => null;
 
+  /// Marks this column as nullable. Nullable columns should not appear in a
+  /// primary key.
+  Builder nullable() => null;
+
   ResultColumn call() => null;
 }
 
diff --git a/sally/pubspec.yaml b/sally/pubspec.yaml
index 8721f7aa..63f61e53 100644
--- a/sally/pubspec.yaml
+++ b/sally/pubspec.yaml
@@ -11,5 +11,8 @@ dependencies:
   meta: '>= 1.0.0 <2.0.0'
 
 dev_dependencies:
+  sally_generator:
+    path: ../sally_generator
+  build_runner: ^1.2.6
   test: ^1.5.3
   mockito: ^4.0.0
diff --git a/sally/test/tables/todos.dart b/sally/test/tables/todos.dart
new file mode 100644
index 00000000..b9b0eb4c
--- /dev/null
+++ b/sally/test/tables/todos.dart
@@ -0,0 +1,10 @@
+import 'package:sally/sally.dart';
+
+@DataClassName('TodoEntry')
+class TodosTable extends Table {
+
+  IntColumn get id => integer().autoIncrement()();
+  TextColumn get title => text().withLength(min: 4, max: 6)();
+  TextColumn get content => text()();
+
+}
\ No newline at end of file
diff --git a/sally_generator/lib/src/model/specified_column.dart b/sally_generator/lib/src/model/specified_column.dart
index f7b326a7..24129069 100644
--- a/sally_generator/lib/src/model/specified_column.dart
+++ b/sally_generator/lib/src/model/specified_column.dart
@@ -47,6 +47,9 @@ class SpecifiedColumn {
   final ColumnType type;
   /// The name of this column, as chosen by the user
   final ColumnName name;
+  /// Whether the user has explicitly declared this column to be nullable, the
+  /// default is false
+  final bool nullable;
 
   /// Whether this column has auto increment.
   bool get hasAI => features.any((f) => f is AutoIncrement);
@@ -96,6 +99,7 @@ class SpecifiedColumn {
       this.dartGetterName,
       this.name,
       this.declaredAsPrimaryKey = false,
+      this.nullable = false,
       this.features = const []});
 }
 
diff --git a/sally_generator/lib/src/parser/column_parser.dart b/sally_generator/lib/src/parser/column_parser.dart
index 339b94a1..93543c5d 100644
--- a/sally_generator/lib/src/parser/column_parser.dart
+++ b/sally_generator/lib/src/parser/column_parser.dart
@@ -17,6 +17,7 @@ const String functionPrimaryKey = 'primaryKey';
 const String functionReferences = 'references';
 const String functionAutoIncrement = 'autoIncrement';
 const String functionWithLength = 'withLength';
+const String functionNullable = 'nullable';
 
 const String errorMessage = 'This getter does not create a valid column that '
     'can be parsed by sally. Please refer to the readme from sally to see how '
@@ -53,6 +54,7 @@ class ColumnParser extends ParserBase {
     String foundStartMethod;
     String foundExplicitName;
     var wasDeclaredAsPrimaryKey = false;
+    var nullable = false;
     // todo parse reference
     final foundFeatures = <ColumnFeature>[];
 
@@ -104,6 +106,8 @@ class ColumnParser extends ParserBase {
           wasDeclaredAsPrimaryKey = true;
           foundFeatures.add(AutoIncrement());
           break;
+        case functionNullable:
+          nullable = true;
       }
 
       // We're not at a starting method yet, so we need to go deeper!
@@ -123,6 +127,7 @@ class ColumnParser extends ParserBase {
         dartGetterName: getter.name.name,
         name: name.escapeIfSqlKeyword(),
         declaredAsPrimaryKey: wasDeclaredAsPrimaryKey,
+        nullable: nullable,
         features: foundFeatures);
   }
 
diff --git a/sally_generator/lib/src/writer/table_writer.dart b/sally_generator/lib/src/writer/table_writer.dart
index d230a797..e3990d00 100644
--- a/sally_generator/lib/src/writer/table_writer.dart
+++ b/sally_generator/lib/src/writer/table_writer.dart
@@ -115,7 +115,7 @@ class TableWriter {
   }
 
   void _writeColumnGetter(StringBuffer buffer, SpecifiedColumn column) {
-    final isNullable = false; // todo nullability for columns
+    final isNullable = column.nullable;
     final additionalParams = <String, String>{};
 
     if (column.hasAI) {