diff --git a/docs/spelling_wordlist.txt b/docs/spelling_wordlist.txt
index 09e5b71..1d5a949 100644
--- a/docs/spelling_wordlist.txt
+++ b/docs/spelling_wordlist.txt
@@ -40,6 +40,8 @@ pycave
 runtime
 scikit
 SequenceData
+Subclasses
+subclasses
 stdout
 TabularData
 tbd