diff --git a/src/Chksum/Program.cs b/src/Chksum/Program.cs
index 0abc8d0..8ce3406 100644
--- a/src/Chksum/Program.cs
+++ b/src/Chksum/Program.cs
@@ -27,7 +27,7 @@ public class Program {
 
                 try {
                     if (args[1] == "MD5") {
-                        
+                        utils.doTheThing(args[1]);
                     }
                     int bufferSize = int.Parse(args[2]);
                     utils.doTheThing(args[1], bufferSize);
@@ -69,7 +69,7 @@ public class Program {
 
     static void PrintAvailableOptions() {
         String[] options = {
-            "checksum - MD5, Murmur and XxHash",
+            "checksum - MD5, Murmur and XxHash - Default buffer size is 4096",
             "compareDatabases",
             "compareChecksums",
             "saveToSqlite",
diff --git a/src/Chksum/chksum.cs b/src/Chksum/chksum.cs
index c4163cb..d024ec1 100644
--- a/src/Chksum/chksum.cs
+++ b/src/Chksum/chksum.cs
@@ -199,7 +199,7 @@ public class ChksumUtils {
         return hash;
     }
 
-    public void doTheThing(string hashalgo, int bufferSize) {
+    public void doTheThing(string hashalgo, int bufferSize = 4096) {
 
         ConnectionMultiplexer redis = ConnectionMultiplexer.Connect("localhost");
         IDatabase db = redis.GetDatabase();