diff --git a/script/tei2korapxml b/script/tei2korapxml
index 7d079ca..7d9cfbd 100755
--- a/script/tei2korapxml
+++ b/script/tei2korapxml
@@ -804,6 +804,11 @@
 Activate minimal debugging.
 Defaults to C<false>.
 
+=item B<KORAPXMLTEI_TOKENIZER_HEAP_SIZE>
+
+Set the heap size for the tokenizer process.
+Defaults to C<512m>.
+
 =back
 
 =head1 COPYRIGHT AND LICENSE