Added docs about the usability of sql objects with copy_expert()sql-copy

See issue #529.

1 files changed, 6 insertions, 5 deletions

diff --git a/lib/sql.py b/lib/sql.py
index ffd9e27..d57fbe2 100644
--- a/lib/sql.py
+++ b/lib/sql.py
@@ -36,8 +36,9 @@ class Composable(object):
     """
     Abstract base class for objects that can be used to compose an SQL string.
 
-    `!Composable` objects can be passed directly to `~cursor.execute()` and
-    `~cursor.executemany()` in place of the query string.
+    `!Composable` objects can be passed directly to `~cursor.execute()`,
+    `~cursor.executemany()`, `~cursor.copy_expert()` in place of the query
+    string.
 
     `!Composable` objects can be joined using the ``+`` operator: the result
     will be a `Composed` instance containing the objects joined. The operator
@@ -58,9 +59,9 @@ class Composable(object):
         :param context: the context to evaluate the string into.
         :type context: `connection` or `cursor`
 
-        The method is automatically invoked by `~cursor.execute()` and
-        `~cursor.executemany()` if a `!Composable` is passed instead of the
-        query string.
+        The method is automatically invoked by `~cursor.execute()`,
+        `~cursor.executemany()`, `~cursor.copy_expert()` if a `!Composable` is
+        passed instead of the query string.
         """
         raise NotImplementedError