diff --git a/scripts/hunspell/isocpp.dic b/scripts/hunspell/isocpp.dic
index 838c740..721e4ba 100644
--- a/scripts/hunspell/isocpp.dic
+++ b/scripts/hunspell/isocpp.dic
@@ -407,6 +407,7 @@ Productinfo
 proto
 ps
 ptr
+ptrdiff
 Ptr
 ptr2
 ptr's