Fix doc comment.
diff --git a/ndn-cpp/c/encoding/binary-xml-data.h b/ndn-cpp/c/encoding/binary-xml-data.h
index cfbfa3d..8e8f13d 100644
--- a/ndn-cpp/c/encoding/binary-xml-data.h
+++ b/ndn-cpp/c/encoding/binary-xml-data.h
@@ -19,9 +19,9 @@
* Encode the data packet as binary XML.
* @param data Pointer to the data object the encode.
* @param signedFieldsBeginOffset Return the offset in the encoding of the beginning of the fields which are signed.
- * If you are not encoding in order to sign, you can ignore this.
+ * If you are not encoding in order to sign, you can ignore this returned value.
* @param signedFieldsEndOffset Return the offset in the encoding of the end of the fields which are signed.
- * If you are not encoding in order to sign, you can ignore this.
+ * If you are not encoding in order to sign, you can ignore this returned value.
* @param encoder Pointer to the ndn_BinaryXmlEncoder struct which receives the encoding.
* @return 0 for success, else an error code.
*/
@@ -32,9 +32,9 @@
* Decode the data packet as binary XML.
* @param data Pointer to the data object the decode.
* @param signedFieldsBeginOffset Return the offset in the encoding of the beginning of the fields which are signed.
- * If you are not encoding in order to sign, you can ignore this.
+ * If you are not decoding in order to verify, you can ignore this returned value.
* @param signedFieldsEndOffset Return the offset in the encoding of the end of the fields which are signed.
- * If you are not encoding in order to sign, you can ignore this.
+ * If you are not decoding in order to verify, you can ignore this returned value.
* @param decoder Pointer to the ndn_BinaryXmlDecoder struct which has been initialized with the buffer to decode.
* @return 0 for success, else an error code.
*/