diff --git a/README.md b/README.md
index fbf44a59..74806a3d 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,84 @@
 **shapito**
 
-PostgreSQL frontend/backend protocol C library.
+PostgreSQL protocol-level client C library.
+
+API reference
+-------------
+
+**PostgreSQL packet validators**
+
+```C
+so_read_startup()
+so_read()
+```
+
+**Frontend to Backend messages **
+
+```C
+so_fewrite_startup_message()
+so_fewrite_cancel()
+so_fewrite_ssl_request()
+so_fewrite_terminate()
+so_fewrite_password()
+so_fewrite_query()
+so_fewrite_parse()
+so_fewrite_bind()
+so_fewrite_describe();
+so_fewrite_execute();
+so_fewrite_sync();
+```
+
+```C
+so_feread_ready();
+so_feread_key();
+so_feread_auth();
+so_feread_parameter();
+```
+
+**Backend to Frontend messages **
+
+```C
+so_bewrite_error()
+so_bewrite_error_fatal()
+so_bewrite_error_panic()
+so_bewrite_notice()
+so_bewrite_authentication_ok()
+so_bewrite_authentication_clear_text()
+so_bewrite_authentication_md5()
+so_bewrite_backend_key_data()
+so_bewrite_parameter_status()
+so_bewrite_empty_query()
+so_bewrite_complete()
+so_bewrite_ready()
+so_bewrite_parse_complete()
+so_bewrite_bind_complete()
+so_bewrite_portal_suspended()
+so_bewrite_no_data()
+```
+
+```C
+so_beread_startup();
+so_beread_password();
+```
+
+**Resizable memory buffer**
+
+```C
+so_stream_init()
+so_stream_free()
+so_stream_size()
+so_stream_used()
+so_stream_left()
+so_stream_reset()
+so_stream_ensure()
+so_stream_advance()
+so_stream_write8()
+so_stream_write16()
+so_stream_write32()
+so_stream_write()
+so_stream_read8()
+so_stream_read16()
+so_stream_read32()
+so_stream_readsz()
+so_stream_read()
+```