to add note about process VCs in eComm use case

docs/index.html

@@ -449,6 +449,18 @@ <h5>E-Commerce</h5>
               assessments, inferences, and data quality remediation on Customs
               pre-entry data.
             </p>
+            <p>
+              NOTE: To facilitate linking and alignment across internal and
+              external processes, many of the VCs modeled in this project are
+              labeled "process" VCs, meaning they refer to the internal
+              processes of a customs agency. Reusability here is likely minimal
+              compared to the rest of the vocabulary, but they are included for
+              informational purposes and to ensure they stay aligned with any
+              changes to the private-sector/logistics-industry data model being
+              consumed by those processes. These may also be less documented
+              than the product- and package- VCs, which correspond to
+              standardized data models in the logistics and shipping sector.
+            </p>
           </dl>
         </section>
       </section>