allow DigestSha256 signing

refs: #4

Change-Id: I94c6499107e31ebfed0dbab71fc204e0443b7754
diff --git a/ndn-traffic-server.conf.sample b/ndn-traffic-server.conf.sample
index 852a0f9..dbd8370 100644
--- a/ndn-traffic-server.conf.sample
+++ b/ndn-traffic-server.conf.sample
@@ -12,7 +12,7 @@
 #   (Optional) MEANS OTHERWISE
 # * ALSO PROVIDED ARE VALID VALUES POSSIBLE FOR EACH PARAMETER
 # * NNI STANDS FOR NON-NEGATIVE INTEGER
-# * RANGE OF POSSIBLE VALUES IS SPECIFIED IN [] 
+# * RANGE OF POSSIBLE VALUES IS SPECIFIED IN []
 #
 #
 #(Mandatory)
@@ -25,6 +25,7 @@
 #ContentBytes=NNI [>0]
 #Content=String
 #ContentDelay=NNI [Milliseconds]
+#SignWithSha256=Bool [0:default, 1:Sha256]
 #
 #
 ##########
@@ -33,5 +34,4 @@
 ##########
 Name=/example/B
 Content=BBBBBBBB
-##########
-
+##########
\ No newline at end of file