diff --git a/.cspell.json b/.cspell.json
index ce61e7c6..22b329c3 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -1591,6 +1591,7 @@
     "subsamples",
     "Subsampling",
     "substr",
+    "substs",
     "subsubcommand",
     "summaryf",
     "superfences",