Indexing of strings.

diff --git a/lib/index.h b/lib/index.h
index 812dbeca47ba964a12d39c38c905edc18b3b0aa9..8a97529380954be6fe4f87cb8ddcc151605a6c03 100644 (file)
--- a/lib/index.h
+++ b/lib/index.h
@@ -32,7 +32,8 @@ enum string_type {
   ST_URL,                              /* URL of the document */
   ST_HOST,                             /* Host name */
   ST_DOMAIN,                           /* Domain name */
-  ST_REF                               /* URL reference */
+  ST_REF,                              /* URL reference */
+  ST_BACKREF,                          /* Back-reference (frame or redirect source) */
 };
 
 /* Index card attributes */