diff --git a/c/include/arrow-adbc/adbc.h b/c/include/arrow-adbc/adbc.h
index a461795ce0..3d098b41fe 100644
--- a/c/include/arrow-adbc/adbc.h
+++ b/c/include/arrow-adbc/adbc.h
@@ -1977,26 +1977,41 @@ AdbcStatusCode AdbcConnectionGetInfo(struct AdbcConnection* connection,
 ///
 /// The result is an Arrow dataset with the following schema:
 ///
-/// | Field Name               | Field Type              |
-/// |--------------------------|-------------------------|
-/// | catalog_name             | utf8                    |
-/// | catalog_db_schemas       | list<DB_SCHEMA_SCHEMA>  |
+/// | Field Name               | Field Type              | Comments |
+/// |--------------------------|-------------------------|----------|
+/// | catalog_name             | utf8                    |          |
+/// | catalog_db_schemas       | list<DB_SCHEMA_SCHEMA>  |          |
+/// | remarks                  | utf8                    | (1)      |
+///
+/// 1. [Since version 1.2.0] A description of the catalog.  This field is
+///    optional.
 ///
 /// DB_SCHEMA_SCHEMA is a Struct with fields:
 ///
-/// | Field Name               | Field Type              |
-/// |--------------------------|-------------------------|
-/// | db_schema_name           | utf8                    |
-/// | db_schema_tables         | list<TABLE_SCHEMA>      |
+/// | Field Name               | Field Type              | Comments |
+/// |--------------------------|-------------------------|----------|
+/// | db_schema_name           | utf8                    |          |
+/// | db_schema_tables         | list<TABLE_SCHEMA>      |          |
+/// | remarks                  | utf8                    | (1)      |
+///
+/// 1. [Since version 1.2.0] A description of the schema.  This field is
+///    optional.
 ///
 /// TABLE_SCHEMA is a Struct with fields:
 ///
-/// | Field Name               | Field Type              |
-/// |--------------------------|-------------------------|
-/// | table_name               | utf8 not null           |
-/// | table_type               | utf8 not null           |
-/// | table_columns            | list<COLUMN_SCHEMA>     |
-/// | table_constraints        | list<CONSTRAINT_SCHEMA> |
+/// | Field Name               | Field Type              | Comments |
+/// |--------------------------|-------------------------|----------|
+/// | table_name               | utf8 not null           |          |
+/// | table_type               | utf8 not null           |          |
+/// | table_columns            | list<COLUMN_SCHEMA>     |          |
+/// | table_constraints        | list<CONSTRAINT_SCHEMA> |          |
+/// | table_definition         | utf8                    | (1)      |
+/// | remarks                  | utf8                    | (2)      |
+///
+/// 1. [Since version 1.2.0] The table or view definition (e.g. a SQL DDL
+///    statement).  This field is optional.
+/// 2. [Since version 1.2.0] A description of the table.  This field is
+///    optional.
 ///
 /// COLUMN_SCHEMA is a Struct with fields:
 ///
@@ -2021,12 +2036,14 @@ AdbcStatusCode AdbcConnectionGetInfo(struct AdbcConnection* connection,
 /// | xdbc_scope_table         | utf8                    | (3)      |
 /// | xdbc_is_autoincrement    | bool                    | (3)      |
 /// | xdbc_is_generatedcolumn  | bool                    | (3)      |
+/// | xdbc_source_data_type    | int16                   | (3, 4)   |
 ///
 /// 1. The column's ordinal position in the table (starting from 1).
 /// 2. Database-specific description of the column.
 /// 3. Optional value.  Should be null if not supported by the driver.
 ///    xdbc_ values are meant to provide JDBC/ODBC-compatible metadata
 ///    in an agnostic manner.
+/// 4. [Since version 1.2.0] This field is optional.
 ///
 /// CONSTRAINT_SCHEMA is a Struct with fields:
 ///
@@ -2089,6 +2106,13 @@ AdbcStatusCode AdbcConnectionGetInfo(struct AdbcConnection* connection,
 /// values may still be null if the driver does not actually support that
 /// field).
 ///
+/// Starting in version 1.2.0, driver-specific fields were introduced to the
+/// schema.  Drivers may add custom fields at the end of any schema above to
+/// reflect vendor-specific metadata.  Applications must access these using an
+/// offset from the end of the schema and cannot assume that the index of the
+/// field will remain stable.  Drivers should prefix field names with the
+/// vendor/driver name to differentiate them (e.g. 'POSTGRESQL:owner').
+///
 /// This AdbcConnection must outlive the returned ArrowArrayStream.
 ///
 /// \param[in] connection The database connection.