diff --git a/doc/src/connection.rst b/doc/src/connection.rst
index 001076a..c44ff7b 100644
--- a/doc/src/connection.rst
+++ b/doc/src/connection.rst
@@ -604,3 +604,9 @@ Connection Object
 
         This attribute is an extension to the DB API definition.
 
+    .. note::
+
+        If you connect to Oracle Database 18 or higher with client libraries
+        12.2 or lower that you will only receive the base version (such as
+        18.0.0.0.0) instead of the full version (18.3.0.0.0).
+