diff --git a/src/sff_convert.cc b/src/sff_convert.cc
index fccbf761..a1d21b7c 100644
--- a/src/sff_convert.cc
+++ b/src/sff_convert.cc
@@ -511,7 +511,7 @@ auto sff_convert(struct Parameters const & parameters) -> void
 
       uint32_t const read_data_length = ((2 * sff_header.flows_per_read) + (3 * read_header.number_of_bases));
       uint32_t const read_data_padded_length = memory_alignment * ((read_data_length + max_padding_length) / memory_alignment);
-      uint32_t const read_data_padding_length = read_data_padded_length - read_data_length;
+      uint32_t const read_data_padding_length = read_data_padded_length - read_data_length;  // refactoring: replace with compute_padding_length()
 
       skip_sff_section(fp_sff, read_data_padding_length, "read data padding");
       filepos += read_data_padding_length;