diff --git a/Documentation.md b/Documentation.md
index b132d99..bf2c464 100644
--- a/Documentation.md
+++ b/Documentation.md
@@ -1,6 +1,20 @@
 ## build
 To build a unsigned apk of the app just do `./gradlew assembleRelease`.
 
+## version name & version code
+We map the version name and version code.
+
+* **Release**: versionName: "0.6.0" -> versionCode: 006000
+* **RC**: versionName: "0.6.0-RC1" -> versionCode: 0059xx (from beta)
+* **Beta**: versionName: "0.5.90" -> versionCode: 005900
+
+A beta release will always be version "x.x.9x". There is a total of 10 "Beta" version names (x.x.90 to x.x.99). The beat version codes will start at `nnpp00` The RC phase the nersion name is always "*VERSION*-RC*X*". Th version code will be increased as with the beta versions. Th final release will be `nnrr00`.
+
+n: 0, currently not used
+r: the release number
+m: minor version
+p: previous version
+
 ## used libraries
 ProjectLaogai uses the following librarys
 * material-dialogs: https://github.com/afollestad/material-dialogs