diff --git a/sqlx-core/src/type_info.rs b/sqlx-core/src/type_info.rs
index bf698251..49fcc16b 100644
--- a/sqlx-core/src/type_info.rs
+++ b/sqlx-core/src/type_info.rs
@@ -1,3 +1,13 @@
 use std::fmt::{Debug, Display};
 
-pub trait TypeInfo: Debug + Display + Clone + PartialEq<Self> {}
+/// Provides information about a SQL type for the database driver.
+///
+/// Currently this only exposes type equality rules that should roughly match the interpretation
+/// in a given database (e.g., in PostgreSQL `VARCHAR` and `TEXT` are roughly equivalent
+/// apart from storage).
+pub trait TypeInfo: Debug + Display + Clone + PartialEq<Self> {
+    /// Returns the database system name of the type. Length specifiers should not be included.
+    /// Common type names are `VARCHAR`, `TEXT`, or `INT`. Type names should be uppercase. They
+    /// should be a rough approximation of how they are written in SQL in the given database.
+    fn name(&self) -> &str;
+}