diff --git a/.cspell.json b/.cspell.json
index a4745a0c0..4c14cb9f3 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -12,6 +12,7 @@
     "Bpearl",
     "calib",
     "centi",
+    "ddeg",
     "DHAVE",
     "Difop",
     "extrinsics",