diff --git a/src/proto.h b/src/proto.h
index 7ddf103..4c7f8c9 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -104,6 +104,7 @@
 # include "json.pro"
 # include "list.pro"
 # include "locale.pro"
+# include "logfile.pro"
 # include "blob.pro"
 # include "main.pro"
 # include "map.pro"
@@ -263,8 +264,9 @@
 #  include "job.pro"
 #  include "channel.pro"
 
-// Not generated automatically, to add extra attribute.
+// Not generated automatically so that we can add an extra attribute.
 void ch_log(channel_T *ch, const char *fmt, ...) ATTRIBUTE_FORMAT_PRINTF(2, 3);
+void ch_error(channel_T *ch, const char *fmt, ...) ATTRIBUTE_FORMAT_PRINTF(2, 3);
 
 # endif