diff --git a/check_source/check_spelling_c_config.py b/check_source/check_spelling_c_config.py
index 9d3f9945f108f96fdfb83870c107704fce185f35..c4cdfc5f32f01c1fc7d5808b54e9e7aadb66153e 100644
--- a/check_source/check_spelling_c_config.py
+++ b/check_source/check_spelling_c_config.py
@@ -68,11 +68,13 @@ dict_custom = {
     "equiangular",
     "finalizer",
     "flushable",
+    "incrementation",
     "initializer"
     "instantiation",
     "jitteryness",
     "merchantability",
     "monospaced",
+    "mutators",
     "natively",
     "overridable",
     "paddings",