1 files changed, 4 insertions, 0 deletions

diff --git a/ot_hex.h b/ot_hex.h
index cb2e86f..3b45b61 100644
--- a/ot_hex.h
+++ b/ot_hex.h
@@ -22,4 +22,8 @@ int   hex_tohash(ot_hash hash, const char *src);
 /* Non-zero if c is a hexadecimal digit, in either case. */
 int   hex_isdigit(int c);
 
+/* The value of a hexadecimal digit, or -1 if c is not one. Shared with the
+   address scanner so that both agree on what a digit is. */
+int   hex_value(int c);
+
 #endif