diff --git a/.tc-environment b/.tc-environment
index a009303d..194e6d52 100644
--- a/.tc-environment
+++ b/.tc-environment
@@ -3,5 +3,6 @@ source .unset-environment
 export HSADMINNG_POSTGRES_RESTRICTED_USERNAME=restricted
 export HSADMINNG_POSTGRES_ADMIN_USERNAME=admin
 export HSADMINNG_SUPERUSER=import-superuser@hostsharing.net
+export HSADMINNG_CAS_SERVER=
 
 export LANG=en_US.UTF-8
diff --git a/.unset-environment b/.unset-environment
index 2be52333..69a50ee3 100644
--- a/.unset-environment
+++ b/.unset-environment
@@ -5,4 +5,5 @@ unset HSADMINNG_POSTGRES_RESTRICTED_USERNAME
 unset HSADMINNG_SUPERUSER
 unset HSADMINNG_MIGRATION_DATA_PATH
 unset HSADMINNG_OFFICE_DATA_SQL_FILE
+unset HSADMINNG_CAS_SERVER=
 
diff --git a/README.md b/README.md
index b803dd3d..f41d0d0a 100644
--- a/README.md
+++ b/README.md
@@ -666,6 +666,29 @@ These profiles mean:
 - **without-test-data**: no test-data is inserted
 
 
+### How to Run the Application in a Debugger
+
+Add `' --debug-jvm` to the command line:
+
+
+```sh
+gw bootRun --debug-jvm
+```
+
+At the very beginning, the application is going to wait for a debugger with a message like this:
+
+> Listening for transport dt_socket at address: 5005
+
+As soon as a debugger connects to that port, the application will continue to run.
+
+In IntelliJ IDEA you need a 'Remote JVM Debug' run configuration like this:
+
+![IntelliJ IDEA JVM-Debug Run Config](./doc/.images/intellij-idea-jvm-debug-run-config.png)
+
+Now, to attach IntelliJ IDEA as a debugger, you just need to run that config in debug mode.
+If it's selected, just hit the *bug*-symbol next to it.
+
+
 ### How to Do a Clean Run of the Application
 
 If you frequently need to run with a fresh database and a clean build, you can use this:
diff --git a/doc/.images/intellij-idea-jvm-debug-run-config.png b/doc/.images/intellij-idea-jvm-debug-run-config.png
new file mode 100644
index 00000000..479df9a2
Binary files /dev/null and b/doc/.images/intellij-idea-jvm-debug-run-config.png differ