diff --git a/fec/src/diag.h b/fec/src/diag.h
index 6211e84..300f90f 100644
--- a/fec/src/diag.h
+++ b/fec/src/diag.h
@@ -12,10 +12,14 @@ typedef struct FeLoc {
 typedef struct FeDiags {
     unsigned long errors;
     unsigned long warnings;
+    const char *source;
+    unsigned long source_len;
 } FeDiags;
 
+void fe_diags_init(FeDiags *d, const char *source, unsigned long source_len);
 void fe_diag_error(FeDiags *d, FeLoc loc, const char *msg);
 void fe_diag_errorf(FeDiags *d, FeLoc loc, const char *msg, const char *arg);
 void fe_diag_note(FeLoc loc, const char *msg);
+void fe_diag_note_src(FeDiags *d, FeLoc loc, const char *msg);
 
 #endif