diff --git a/docs/ref/models/querysets.txt b/docs/ref/models/querysets.txt
index 484d8b4ff7..4680cee1e6 100644
--- a/docs/ref/models/querysets.txt
+++ b/docs/ref/models/querysets.txt
@@ -1911,6 +1911,9 @@ SQL equivalent:
 
     SELECT ... WHERE x=1 OR y=2
 
+``|`` is not a commutative operation, as different (though equivalent) queries
+may be generated.
+
 Methods that do not return ``QuerySet``\s
 -----------------------------------------