diff --git a/src/sources/source.h b/src/sources/source.h
index 125bfe7..f344757 100644
--- a/src/sources/source.h
+++ b/src/sources/source.h
@@ -22,7 +22,8 @@ extern cfg_t *create(const char *init);
 extern bool   config(cfg_t *c, const char *key, const char *value);
 extern bool    ready(cfg_t *c);
 extern char   *error(cfg_t *c);
+extern void  errorcb(cfg_t *c, void (*cb)(char *errstr));
 extern bool    start(cfg_t *c);
-extern bool     stop(cfg_t *c);
 extern bool     next(cfg_t *c, char *buf, size_t bufsize, bool reset);
+extern bool     stop(cfg_t *c);
 extern void  destroy(cfg_t *c);