diff --git a/pdf.c b/pdf.c
index 2729f9a4718c973e826e9db1b385e75c41b7f1e9..8afa86866317dfb9b8900153ad23240fb8a17c30 100644
--- a/pdf.c
+++ b/pdf.c
@@ -657,6 +657,12 @@ init_parser(struct Env *aux)
 	H_RULE(startxr,	SEQ(nl, KW("startxref"), nl,
 			    lws, nat, nl,
 			    LIT("%%EOF"), CHX(nl, end)));
+		// XXX the real world sometimes omits nl after %%EOF inside the file.
+		//     the next 'tail' would be appended right after the 'F',
+		//     presumably because the previous version of the file
+		//     ended without a trailing newline. m)
+		//     this is invalid per spec, because it creates a run-on 
+		//     comment, but we should probably accept-and-warn.
 		// XXX should lws be allowed before EOF marker?
 		// NB: lws before xref offset is allowed, cf. p.48 (example 4)
 	H_RULE(xr_td,	SEQ(xrefs, KW("trailer"), ws, dict));