diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 2d53f3bce4..22f3f1fef2 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt
@@ -2,6 +2,7 @@
 2rd->2nd
 2st->2nd
 3nd->3rd
+3rt->3rd
 3st->3rd
 4rd->4th
 a-diaerers->a-diaereses