diff --git a/ndn-cpp/c/encoding/binary-xml-encoder.h b/ndn-cpp/c/encoding/binary-xml-encoder.h
index ff9ee30..3f22319 100644
--- a/ndn-cpp/c/encoding/binary-xml-encoder.h
+++ b/ndn-cpp/c/encoding/binary-xml-encoder.h
@@ -134,7 +134,7 @@
 }
 
 /**
- * Write a BLOB header, then the absolute value of value to self->output encoded as big endian.
+ * Write a BLOB header, then the absolute value of value, rounded to an integer, to self->output encoded as big endian.
  * @param self pointer to the ndn_BinaryXmlEncoder struct
  * @param value the double to encode as big endian.  If value is 0, the big endian encoding has zero bytes.
  * The value is converted to absolute value.