diff --git a/cmd/dinosql/main.go b/cmd/dinosql/main.go
index c65eac4b49..53fe791051 100644
--- a/cmd/dinosql/main.go
+++ b/cmd/dinosql/main.go
@@ -8,20 +8,8 @@ import (
 )
 
 func main() {
-	pkg := flag.String("package", "db", "package name for Go code")
-	sch := flag.String("schema", "", "input directory of SQL migrations")
-	prepare := flag.Bool("prepare", false, "include prepared query support")
-	tags := flag.Bool("tags", false, "add tags to database records")
-	out := flag.String("out", "db.go", "output file")
 	flag.Parse()
-
-	settings := dinosql.GenerateSettings{
-		Package:             *pkg,
-		EmitPreparedQueries: *prepare,
-		EmitTags:            *tags,
-	}
-
-	if err := dinosql.Exec(*sch, flag.Arg(0), *out, settings); err != nil {
+	if err := dinosql.Exec(flag.Arg(0)); err != nil {
 		log.Fatal(err)
 	}
 }
diff --git a/exec.go b/exec.go
index dd1a320827..bcd0c0e1f5 100644
--- a/exec.go
+++ b/exec.go
@@ -1,20 +1,31 @@
 package dinosql
 
 import (
+	"encoding/json"
 	"io/ioutil"
 )
 
-func Exec(schemaDir, queryDir, out string, settings GenerateSettings) error {
-	s, err := ParseSchmea(schemaDir)
+func Exec(settingsPath string) error {
+	blob, err := ioutil.ReadFile(settingsPath)
 	if err != nil {
 		return err
 	}
 
-	q, err := ParseQueries(s, queryDir)
+	var settings GenerateSettings
+	if err := json.Unmarshal(blob, &settings); err != nil {
+		return err
+	}
+
+	s, err := ParseSchmea(settings.SchemaDir)
+	if err != nil {
+		return err
+	}
+
+	q, err := ParseQueries(s, settings.QueryDir)
 	if err != nil {
 		return err
 	}
 
 	source := generate(q, settings)
-	return ioutil.WriteFile(out, []byte(source), 0644)
+	return ioutil.WriteFile(settings.Out, []byte(source), 0644)
 }
diff --git a/goose.go b/goose.go
new file mode 100644
index 0000000000..aa4037d0c2
--- /dev/null
+++ b/goose.go
@@ -0,0 +1,15 @@
+package dinosql
+
+import "strings"
+
+// Remove all lines after a `-- +goose Down` comment
+func RemoveGooseRollback(contents string) string {
+	lines := strings.Split(contents, "\n")
+	for i, line := range lines {
+		if strings.HasPrefix(strings.TrimSpace(line), "-- +goose Down") {
+			lines = lines[:i]
+			break
+		}
+	}
+	return strings.Join(lines, "\n")
+}
diff --git a/goose_test.go b/goose_test.go
new file mode 100644
index 0000000000..2aadaec17e
--- /dev/null
+++ b/goose_test.go
@@ -0,0 +1,26 @@
+package dinosql
+
+import (
+	"testing"
+
+	"github.com/google/go-cmp/cmp"
+)
+
+const inputMigration = `
+-- +goose Up
+ALTER TABLE archived_jobs ADD COLUMN expires_at TIMESTAMP WITH TIME ZONE;
+
+-- +goose Down
+ALTER TABLE archived_jobs DROP COLUMN expires_at;
+`
+
+const outputMigration = `
+-- +goose Up
+ALTER TABLE archived_jobs ADD COLUMN expires_at TIMESTAMP WITH TIME ZONE;
+`
+
+func TestRemoveGooseRollback(t *testing.T) {
+	if diff := cmp.Diff(outputMigration, RemoveGooseRollback(inputMigration)); diff != "" {
+		t.Errorf("migration mismatch:\n%s", diff)
+	}
+}
diff --git a/parser.go b/parser.go
index 2c98849d33..2e8cda3cd5 100644
--- a/parser.go
+++ b/parser.go
@@ -57,7 +57,8 @@ func ParseSchmea(dir string) (*postgres.Schema, error) {
 		if err != nil {
 			return nil, err
 		}
-		tree, err := pg.Parse(string(blob))
+		contents := RemoveGooseRollback(string(blob))
+		tree, err := pg.Parse(contents)
 		if err != nil {
 			return nil, err
 		}
@@ -1053,10 +1054,20 @@ func lowerTitle(s string) string {
 	return string(a)
 }
 
+type TypeOverride struct {
+	Package      string `json:"package"`
+	PostgresType string `json:"postgres_type"`
+	GoType       string `json:"go_type"`
+}
+
 type GenerateSettings struct {
-	Package             string
-	EmitPreparedQueries bool
-	EmitTags            bool
+	SchemaDir           string         `json:"schema"`
+	QueryDir            string         `json:"queries"`
+	Out                 string         `json:"out"`
+	Package             string         `json:"package"`
+	EmitPreparedQueries bool           `json:"emit_prepared_queries"`
+	EmitTags            bool           `json:"emit_tags"`
+	Overrides           []TypeOverride `json:"overrides"`
 }
 
 func generate(r *Result, settings GenerateSettings) string {