diff --git a/include/ndn-cpp/c/interest-types.h b/include/ndn-cpp/c/interest-types.h
index 21c80d9..a464e17 100644
--- a/include/ndn-cpp/c/interest-types.h
+++ b/include/ndn-cpp/c/interest-types.h
@@ -16,7 +16,18 @@
   ndn_Exclude_ANY = 1  
 } ndn_ExcludeType;
 
+enum {
+  ndn_Interest_CHILD_SELECTOR_LEFT = 0,
+  ndn_Interest_CHILD_SELECTOR_RIGHT = 1,
 
+  ndn_Interest_ANSWER_NO_CONTENT_STORE = 0,
+  ndn_Interest_ANSWER_CONTENT_STORE = 1,
+  ndn_Interest_ANSWER_GENERATED = 2,
+  ndn_Interest_ANSWER_STALE = 4,    // Stale answer OK
+  ndn_Interest_MARK_STALE = 16,      // Must have scope 0.  Michael calls this a "hack"
+
+  ndn_Interest_DEFAULT_ANSWER_ORIGIN_KIND = ndn_Interest_ANSWER_CONTENT_STORE | ndn_Interest_ANSWER_GENERATED
+};
 
 #ifdef __cplusplus
 }