diff --git a/src/index.js b/src/index.js
index 0573e2bc..77fb36ce 100644
--- a/src/index.js
+++ b/src/index.js
@@ -98,7 +98,8 @@ function Postgres(a, b) {
       notify,
       array,
       json,
-      file
+      file,
+      addType
     })
 
     return sql
@@ -563,3 +564,12 @@ function osUsername() {
     return process.env.USERNAME || process.env.USER || process.env.LOGNAME  // eslint-disable-line
   }
 }
+
+async function addType(name, { serializer, parser }) {
+  const [{ oid }] = await this`
+    select oid from pg_type where typname = ${name} 
+  `;
+  this.typed[name] = (x) => this.typed(x, oid);
+  this.options.serializers[oid] = serializer;
+  this.options.parsers[oid] = parser;
+}
\ No newline at end of file
diff --git a/tests/index.js b/tests/index.js
index bf81b036..5400f655 100644
--- a/tests/index.js
+++ b/tests/index.js
@@ -2580,3 +2580,21 @@ t('arrays in reserved connection', async() => {
     x.join('')
   ]
 })
+
+t('addType', async () => {
+  const sql = postgres(options)
+  await sql.addType('point', {
+    serializer: (v) => `(${v.x},${v.y})`,
+    parser: (v) => {
+      const [x, y] = v.slice(1, -1).split(',')
+      return { x: parseFloat(x), y: parseFloat(y) }
+    }
+  })
+  await sql`create table test (p point)`
+  const data = { x: 1, y: 2 }
+  await sql`insert into test values(${sql.typed.point(data)})`
+
+  const [{ p }] = await sql`select p from test`
+  const equal = p.x === data.x && p.y === data.y
+  return [equal, true, await sql`drop table test`]
+})
diff --git a/types/index.d.ts b/types/index.d.ts
index 8989ff47..d34b2a64 100644
--- a/types/index.d.ts
+++ b/types/index.d.ts
@@ -704,6 +704,8 @@ declare namespace postgres {
     json(value: JSONValue): Parameter;
 
     reserve(): Promise<ReservedSql<TTypes>>
+
+    addType<T>(name: string, handler: { serializer: (x: T) => any, parser: (x: any) => T}): void;
   }
 
   interface UnsafeQueryOptions {