If unable to read clock tree, inform user
diff --git a/powerdebug.h b/powerdebug.h
index 4ed450d..75171b0 100644
--- a/powerdebug.h
+++ b/powerdebug.h
@@ -65,7 +65,7 @@
extern void print_clock_info(int verbose, int hrow, int selected);
extern void get_sensor_info(char *path, char *name, char *sensor, int verbose);
extern void print_string_val(char *name, char *val);
-extern void init_clock_details(void);
+extern int init_clock_details(void);
extern void print_clock_header(void);
extern void print_sensor_header(void);
extern void print_one_clock(int line, char *str, int bold, int highlight);