diff --git a/tables/sydmath/sydmath.txt b/tables/sydmath/sydmath.txt
index c90014a..ff22b8a 100644
--- a/tables/sydmath/sydmath.txt
+++ b/tables/sydmath/sydmath.txt
@@ -2672,3 +2672,5 @@ Length=20
 \flat ♭
 \natural ♮
 \sharp ♯
+\- −
+\+ ＋