diff --git a/Documentation.md b/Documentation.md
index 21ed6a3..fbd6519 100644
--- a/Documentation.md
+++ b/Documentation.md
@@ -29,7 +29,7 @@ Implement the following steps for compressing a floating point data array:
 bwc_codec *coder = bwc_alloc_coder(countDim1, countDim2 countDim3, countDim4, nPar, precision);
 bwc_stream *stream = bwc_init_stream(orig_in, comp_out, comp);
 bwc_create_compression(coder, stream, rate);
-bwc_compress(coder, stream);
+size_t compressed_size = bwc_compress(coder, stream);
 bwc_free_codec(coder);
 ```