diff --git a/CHANGELOG.md b/CHANGELOG.md
index 1d13163..2797de1 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,9 +1,12 @@
 ## Changelog
 
-### v5.2.0beta (2021-04-02)
-* some renaming to optimize automated build
-* changes in versioning
-* delete travis for automated build
+### v5.2.1beta (2021-05-04)
+* added expose for default admin ui port (#172)
+* added shortform for maintenance script
+* v5.2.0beta (2021-04-02)
+  * some renaming to optimize automated build
+  * changes in versioning
+  * delete travis for automated build
 
 ### v5.1.0 (2020-11-05)
 * v5.0.2beta (2020-07-28)
diff --git a/amd64/Dockerfile b/amd64/Dockerfile
index c32b42b..b821850 100644
--- a/amd64/Dockerfile
+++ b/amd64/Dockerfile
@@ -95,6 +95,9 @@ ENV DEBIAN_FRONTEND="teletype" \
     SETUID=1000 \
     TZ="Europe/Berlin"
 
+# Expose default admin ui port
+EXPOSE 8081
+
 # Healthcheck
 HEALTHCHECK --interval=15s --timeout=5s --retries=5 \
     CMD ["/bin/bash", "-c", "/opt/scripts/healthcheck.sh"]
diff --git a/amd64/scripts/iobroker_startup.sh b/amd64/scripts/iobroker_startup.sh
index e9fa617..67c1ffb 100644
--- a/amd64/scripts/iobroker_startup.sh
+++ b/amd64/scripts/iobroker_startup.sh
@@ -96,6 +96,7 @@ then
   then
     echo "Registering maintenance script as command."
     echo "alias maintenance=\'/opt/scripts/maintenance.sh\'" >> /root/.bashrc
+    echo "alias maint=\'/opt/scripts/maintenance.sh\'" >> /root/.bashrc
     echo "Done."
     echo ' '
   fi
diff --git a/arm32v7/scripts/iobroker_startup.sh b/arm32v7/scripts/iobroker_startup.sh
index e9fa617..67c1ffb 100644
--- a/arm32v7/scripts/iobroker_startup.sh
+++ b/arm32v7/scripts/iobroker_startup.sh
@@ -96,6 +96,7 @@ then
   then
     echo "Registering maintenance script as command."
     echo "alias maintenance=\'/opt/scripts/maintenance.sh\'" >> /root/.bashrc
+    echo "alias maint=\'/opt/scripts/maintenance.sh\'" >> /root/.bashrc
     echo "Done."
     echo ' '
   fi
diff --git a/arm64v8/scripts/iobroker_startup.sh b/arm64v8/scripts/iobroker_startup.sh
index e9fa617..67c1ffb 100644
--- a/arm64v8/scripts/iobroker_startup.sh
+++ b/arm64v8/scripts/iobroker_startup.sh
@@ -96,6 +96,7 @@ then
   then
     echo "Registering maintenance script as command."
     echo "alias maintenance=\'/opt/scripts/maintenance.sh\'" >> /root/.bashrc
+    echo "alias maint=\'/opt/scripts/maintenance.sh\'" >> /root/.bashrc
     echo "Done."
     echo ' '
   fi