diff --git a/adoc/chapters/programming_interface.adoc b/adoc/chapters/programming_interface.adoc
index 0f133413..21e168e8 100644
--- a/adoc/chapters/programming_interface.adoc
+++ b/adoc/chapters/programming_interface.adoc
@@ -16996,7 +16996,12 @@ a@
 ----
 template <typename asT> asT as() const
 ----
-   a@ Bitwise reinterprets this SYCL [code]#vec# as a SYCL [code]#vec# of a different element type and number of elements specified by [code]#asT#. The new SYCL [code]#vec# type must have the same storage size in bytes as this SYCL [code]#vec#.
+   a@ Bitwise reinterprets this SYCL [code]#vec# as a SYCL [code]#vec# of a
+      different element type and number of elements specified by [code]#asT#.
+      The new SYCL [code]#vec# type must have the same storage size in bytes as
+      this SYCL [code]#vec#, and the size of the elements in the new SYCL
+      [code]#vec# ([code]#NumElements * sizeof(DataT)#) must be the same as the
+      size of the elements in this SYCL [code]#vec#.
 
 a@
 [source]