diff --git a/thecl/thecl10.c b/thecl/thecl10.c
index efc6911..c351661 100644
--- a/thecl/thecl10.c
+++ b/thecl/thecl10.c
@@ -1093,6 +1093,7 @@ static const id_format_pair_t th20_fmts[] = {
     { 546, "S" },
     { 547, "S" },
     { 548, "" },
+    { 559, "f" },
     { 564, "" },
     { 565, "" },
     { 566, "S" },