diff --git a/adoc/chapters/programming_interface.adoc b/adoc/chapters/programming_interface.adoc
index 37f35308..0cf978ea 100644
--- a/adoc/chapters/programming_interface.adoc
+++ b/adoc/chapters/programming_interface.adoc
@@ -13885,9 +13885,10 @@ property::reduction::initialize_to_identity
       identity value passed to the reduction interface, or to the identity
       value determined by the [code]#known_identity# trait if no identity value
       was specified. If no identity value was specified and an identity value
-      cannot be determined by the [code]#known_identity# trait, the compiler
-      must raise a diagnostic. When this property is set, the original value of
-      the reduction variable is not included in the reduction.
+      cannot be determined by the [code]#known_identity# trait, the
+      implementation must throw an [code]#exception# with the
+      [code]#errc::invalid# error code. When this property is set, the original
+      value of the reduction variable is not included in the reduction.
 
 |====