diff --git a/src/main/java/BiGpairSEQ.java b/src/main/java/BiGpairSEQ.java
index 3e67a68..7b3cb95 100644
--- a/src/main/java/BiGpairSEQ.java
+++ b/src/main/java/BiGpairSEQ.java
@@ -16,6 +16,7 @@ public class BiGpairSEQ {
     private static String priorityQueueHeapType = "FIBONACCI";
     private static boolean outputBinary = true;
     private static boolean outputGraphML = false;
+    private static final String version = "version 2.0";
 
     public static void main(String[] args) {
         if (args.length == 0) {
@@ -172,5 +173,5 @@ public class BiGpairSEQ {
 
     public static boolean outputGraphML() {return outputGraphML;}
     public static void setOutputGraphML(boolean b) {outputGraphML = b;}
-
+    public static String getVersion() { return version; }
 }
diff --git a/src/main/java/CommandLineInterface.java b/src/main/java/CommandLineInterface.java
index b0d2a64..8549ee7 100644
--- a/src/main/java/CommandLineInterface.java
+++ b/src/main/java/CommandLineInterface.java
@@ -72,6 +72,9 @@ public class CommandLineInterface {
                 System.out.println();
                 formatter.printHelp("BiGpairSEQ_Sim.jar -match", matchOptions);
             }
+            else if (line.hasOption("version")) {
+                System.out.println("BiGpairSEQ_Sim " + BiGpairSEQ.getVersion());
+            }
             else if (line.hasOption("cells")) {
                 line = parser.parse(cellOptions, Arrays.copyOfRange(args, 1, args.length));
                 Integer number = Integer.valueOf(line.getOptionValue("n"));
@@ -230,8 +233,11 @@ public class CommandLineInterface {
                 .longOpt("match-cdr3")
                 .desc("Matches CDR3s. Requires a graph/data file.")
                 .build();
+        Option printVersion = Option.builder("version")
+                .desc("Print the version number").build();
         OptionGroup mainGroup = new OptionGroup();
         mainGroup.addOption(help);
+        mainGroup.addOption(printVersion);
         mainGroup.addOption(makeCells);
         mainGroup.addOption(makePlate);
         mainGroup.addOption(makeGraph);
diff --git a/src/main/java/InteractiveInterface.java b/src/main/java/InteractiveInterface.java
index bcedcbc..7080807 100644
--- a/src/main/java/InteractiveInterface.java
+++ b/src/main/java/InteractiveInterface.java
@@ -570,6 +570,8 @@ public class InteractiveInterface {
     }
 
     private static void acknowledge(){
+        System.out.println("BiGpairSEQ_Sim " + BiGpairSEQ.getVersion());
+        System.out.println();
         System.out.println("This program simulates BiGpairSEQ, a graph theory based adaptation");
         System.out.println("of the pairSEQ algorithm for pairing T cell receptor sequences.");
         System.out.println();