Minor javadoc improvement for @JsonTypeInfo.defaultImpl
diff --git a/src/main/java/com/fasterxml/jackson/annotation/JsonTypeInfo.java b/src/main/java/com/fasterxml/jackson/annotation/JsonTypeInfo.java
index ecf74d6..5fce882 100644
--- a/src/main/java/com/fasterxml/jackson/annotation/JsonTypeInfo.java
+++ b/src/main/java/com/fasterxml/jackson/annotation/JsonTypeInfo.java
@@ -234,7 +234,8 @@
* class to use for deserialization if type identifier is either not present,
* or can not be mapped to a registered type (which can occur for ids,
* but not when specifying explicit class to use).
- * Property has no effect on serialization.
+ * Property has no effect on choice of type id used for serialization;
+ * it is only used in deciding what to do for otherwise unmappable cases.
*<p>
* Note that while this property allows specification of the default
* implementation to use, it does not help with structural issues that