-KNOWNID(PRODUCT_FLAGS, "product:flags"),
-KNOWNID(PRODUCT_PRODUCTLINE, "product:productline"),
-KNOWNID(PRODUCT_REGISTER_TARGET, "product:regtarget"),
-KNOWNID(PRODUCT_REGISTER_RELEASE, "product:regrelease"),
-
-/* argh */
+KNOWNID(PRODUCT_FLAGS, "product:flags"), /* e.g. 'update', 'no_you' */
+KNOWNID(PRODUCT_PRODUCTLINE, "product:productline"), /* installed product only */
+KNOWNID(PRODUCT_REGISTER_TARGET, "product:regtarget"), /* installed and available product */
+KNOWNID(PRODUCT_REGISTER_RELEASE, "product:regrelease"), /* installed product only */
+KNOWNID(PRODUCT_UPDATES_REPOID, "product:updates:repoid"),
+KNOWNID(PRODUCT_UPDATES, "product:updates"),
+KNOWNID(PRODUCT_ENDOFLIFE, "product:endoflife"),
+
+/* argh, should rename to repository and unify with REPOMD */