diff --git a/spring-framework-reference/src/cache.xml b/spring-framework-reference/src/cache.xml
index 0e35e9ec662..7ea610ed26e 100644
--- a/spring-framework-reference/src/cache.xml
+++ b/spring-framework-reference/src/cache.xml
@@ -92,6 +92,7 @@ public Book findBook(ISBN isbn) {...}]]>
If only one param is given, return that instance.
If more the one param is given, return a key computed from the hashes of all parameters.
+
This approach works well for objects with natural keys as long as the hashCode() reflects that. If that is not the case then
for distributed or persistent environments, the strategy needs to be changed as the objects hashCode is not preserved.
In fact, depending on the JVM implementation or running conditions, the same hashCode can be reused for different objects, in the same VM instance.