diff --git a/README.md b/README.md
index 0d8761712f9bf85b986ed8822c2876246c19f7a0..37bcb85170c148361142a5ae9fc8ad7c44d26efc 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,7 @@ Launch _MSTclust_ without option to read the following documentation:
                 (default: not set)
  -R <integer>   number of replicates for  data perturbation and subsampling
                 analyses (default: 100)
+ -t             tab-delimited results printed in stdout (default: not set)
  -h             writing a  single-linkage  hierarchical classification tree
                 into an output file (default: not set)
  -m             writing  a  minimum  spanning  tree  into  an  output  file
diff --git a/src/MSTclust.java b/src/MSTclust.java
index e2c7a3f42926d8f87f1be4b5b923e2656b1dc645..b70e755efc7bcc138786fd6ad97676a98c98d9d6 100644
--- a/src/MSTclust.java
+++ b/src/MSTclust.java
@@ -28,6 +28,9 @@
 */
 /*
   ########################################################################################################
+  ## v0.21.200603ac
+  +  man updated
+
   ## v0.2.200601ac
   +  new option -g to compute silhouettes using generalized mean with any integer exponent
   ########################################################################################################
@@ -39,7 +42,7 @@ import java.util.*;
 public class MSTclust {
 
     //### constants  ###############################################################################################
-    final static String VERSION = "0.2.200528ac";
+    final static String VERSION = "0.21.200528ac";
     final static String NOTHING = "N.o./.T.h.I.n.G";
     final static short EMPTY = 0;
     final static String BLANK = "                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        ";
@@ -148,6 +151,7 @@ public class MSTclust {
 	    System.out.println("                (default: not set)");
 	    System.out.println(" -R <integer>   number of replicates for  data perturbation and subsampling");
 	    System.out.println("                analyses (default: 100)");
+	    System.out.println(" -t             tab-delimited results printed in stdout (default: not set)");
 	    System.out.println(" -h             writing a  single-linkage  hierarchical classification tree");
 	    System.out.println("                into an output file (default: not set)");
 	    System.out.println(" -m             writing  a  minimum  spanning  tree  into  an  output  file");