diff --git a/src/datajoint/schemas.py b/src/datajoint/schemas.py
index 1e2d9cfc2..1a9958a21 100644
--- a/src/datajoint/schemas.py
+++ b/src/datajoint/schemas.py
@@ -899,7 +899,7 @@ def virtual_schema(
     --------
     >>> lab = dj.virtual_schema('my_lab')
     >>> lab.Subject.fetch()
-    >>> lab.Session & 'subject_id="M001"'
+    >>> lab.Session & "subject_id='M001'"
 
     See Also
     --------