diff -r 3f655b1b0d93 -r 5e27fa988c5c bookloupe/counters.h
--- a/bookloupe/counters.h	Sat Sep 21 18:28:40 2013 +0100
+++ b/bookloupe/counters.h	Mon Sep 30 08:18:42 2013 +0100
@@ -3,6 +3,12 @@
 
 #include <glib.h>
 
+/* Special counters live in the private use area */
+enum {
+    COUNTER_ILLUSTRATION=0xE000,
+    NO_SPECIAL_COUNTERS
+};
+
 struct counters {
     GTree *matching;
     long quot;
@@ -12,6 +18,7 @@
 void increment_matching(struct counters *counters,gunichar ch,gboolean open);
 int matching_count(const struct counters *counters,gunichar ch,gboolean open);
 int matching_difference(const struct counters *counters,gunichar ch);
+void counters_reset(struct counters *counters);
 void counters_destroy(struct counters *counters);
 
 #endif /* COUNTERS_H */