Add substructure

diff --git a/codespell_lib/data/dictionary.txt b/codespell_lib/data/dictionary.txt
index 52b090c..0b11145 100644
--- a/codespell_lib/data/dictionary.txt
+++ b/codespell_lib/data/dictionary.txt

@@ -25596,6 +25596,8 @@
 substracting->subtracting
 substraction->subtraction
 substracts->subtracts
+substucture->substructure
+substuctures->substructures
 substutite->substitute
 subsysthem->subsystem
 subsysthems->subsystems