1 files changed, 12 insertions, 3 deletions
diff --git a/lib/sqlalchemy/exc.py b/lib/sqlalchemy/exc.py
index 9b9c82aca..7fa77120c 100644
--- a/lib/sqlalchemy/exc.py
+++ b/lib/sqlalchemy/exc.py
@@ -685,8 +685,9 @@ class SADeprecationWarning(HasDescriptionCode, DeprecationWarning):
     "Indicates the version that started raising this deprecation warning"
 
 
-class RemovedIn20Warning(SADeprecationWarning):
-    """Issued for usage of APIs specifically deprecated in SQLAlchemy 2.0.
+class Base20DeprecationWarning(SADeprecationWarning):
+    """Issued for usage of APIs specifically deprecated or legacy in
+    SQLAlchemy 2.0.
 
     .. seealso::
 
@@ -701,11 +702,19 @@ class RemovedIn20Warning(SADeprecationWarning):
 
     def __str__(self):
         return (
-            super(RemovedIn20Warning, self).__str__()
+            super(Base20DeprecationWarning, self).__str__()
             + " (Background on SQLAlchemy 2.0 at: https://sqlalche.me/e/b8d9)"
         )
 
 
+class LegacyAPIWarning(Base20DeprecationWarning):
+    """indicates an API that is in 'legacy' status, a long term deprecation."""
+
+
+class RemovedIn20Warning(Base20DeprecationWarning):
+    """indicates an API that will be fully removed in SQLAlchemy 2.0."""
+
+
 class MovedIn20Warning(RemovedIn20Warning):
     """Subtype of RemovedIn20Warning to indicate an API that moved only."""