diff --git a/CHANGELOG.md b/CHANGELOG.md
index b781be7..04917f9 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,7 +1,9 @@
 # Changelog
 
-## [1.9.900] - 2021-09-24
+## [2.0] - 2021-10-07
 - for `.*\\.(freq|tsv)(\\.gz)?` input files automatically cumulate frequencies
 - -N option added to sort keys with same frequency numerically
 - --pad option added to optionally add padding symbols at text edges
 - jar is now called totalngrams-2.0.jar
+- support xz compression for input and output (single-threaded and slow)
+- let number of folds default to 1 (-F <n> option)
diff --git a/pom.xml b/pom.xml
index a1c5588..6378f72 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,8 +5,8 @@
     <modelVersion>4.0.0</modelVersion>
 
     <groupId>groupId</groupId>
-    <version>1.9.900</version>
     <artifactId>totalngrams</artifactId>
+    <version>2.0</version>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
@@ -159,7 +159,7 @@
                     <binFolder>bin</binFolder>
                     <extraJvmArguments>-Xmx512000m</extraJvmArguments>
                     <binFileExtensions>
-                        <unix></unix>
+                        <unix/>
                     </binFileExtensions>
                     <programs>
                         <program>
diff --git a/src/main/java/org/ids_mannheim/TotalNGrams.java b/src/main/java/org/ids_mannheim/TotalNGrams.java
index 70d4103..717fc08 100644
--- a/src/main/java/org/ids_mannheim/TotalNGrams.java
+++ b/src/main/java/org/ids_mannheim/TotalNGrams.java
@@ -19,7 +19,7 @@
 
 
 @CommandLine.Command(mixinStandardHelpOptions = true,
-        name = "totalngrams", description = "sum ngram counts from KorAP-XML, CoNLL-U files and frequency lists")
+        name = "totalngrams", version = "2.0", description = "sum ngram counts from KorAP-XML, CoNLL-U files and frequency lists")
 
 public class TotalNGrams implements Callable<Integer> {
     static public final Logger logger;