diff --git a/.custom_wordlist.txt b/.custom_wordlist.txt
index 714eae1..89e9590 100644
--- a/.custom_wordlist.txt
+++ b/.custom_wordlist.txt
@@ -63,6 +63,7 @@ callgrind
 Canonical's
 CanonicalUrlData
 capitalization
+castable
 CategoryTesting
 CategoryTipsAndTricks
 cd