diff --git a/adoc/chapters/programming_interface.adoc b/adoc/chapters/programming_interface.adoc
index 8a35db17..f6cefdfd 100644
--- a/adoc/chapters/programming_interface.adoc
+++ b/adoc/chapters/programming_interface.adoc
@@ -5598,7 +5598,7 @@ void set_final_data(Destination finalData = nullptr)
       the image processing is going to be copied to at destruction
       time, if the image was involved with a write accessor.
 
-Destination can be either an output iterator, a
+Destination can be either an output iterator, or a
 [code]#std::weak_ptr<T>#.
 
 Note that a raw pointer is a special case of output iterator and