diff --git a/docker-compose.yml b/docker-compose.yml
index 130ee20..c124ac7 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     depends_on:
         - redis
     environment:
+      DEV_MODE: ${DEV_MODE:-}
       DOMAIN: ${DOMAIN}
       SHARED_SECRET: ${SHARED_SECRET}
       WELCOME_MESSAGE: ${WELCOME_MESSAGE:-}
@@ -147,6 +148,7 @@ services:
       DISABLE_VIDEO_PREVIEW: ${DISABLE_VIDEO_PREVIEW:-false}
       CHAT_ENABLED: ${CHAT_ENABLED:-true}
       CHAT_START_CLOSED: ${CHAT_START_CLOSED:-false}
+      DEV_MODE: ${DEV_MODE:-}
     networks:
       bbb-net:
         ipv4_address: 10.7.7.11
diff --git a/docs/development.md b/docs/development.md
new file mode 100644
index 0000000..4a72642
--- /dev/null
+++ b/docs/development.md
@@ -0,0 +1,45 @@
+# bbb-docker Development
+
+## Running
+you can run bbb-docker locally without any certificate issues with following `.env` configurations:
+
+```
+DEV_MODE=true
+
+ENABLE_HTTPS_PROXY=true
+#ENABLE_COTURN=true
+#ENABLE_GREENLIGHT=true
+#ENABLE_WEBHOOKS=true
+
+DOMAIN=10.7.7.1
+EXTERNAL_IP=10.7.7.1
+STUN_IP=216.93.246.18
+STUN_PORT=3478
+TURN_SERVER=turns:localhost:465?transport=tcp
+
+TURN_SECRET=SuperTurnSecret
+SHARED_SECRET=SuperSecret
+ETHERPAD_API_KEY=SuperEtherpadKey
+RAILS_SECRET=SuperRailsSecret
+
+# ====================================
+# CUSTOMIZATION
+# ====================================
+
+[... add rest of sample.env here ...]
+```
+
+- you can than start it with \
+  `$ ./scripts/compose up -d`
+- view the logs with \
+  `$ ./scripts/compose logs -f`
+- and access the API via \
+  https://mconf.github.io/api-mate/#server=https://10.7.7.1/bigbluebutton/api&sharedSecret=SuperSecret
+    * At some point your browser will warn you about an invalid certificate, but you can press _"Accept the Risk and Continue" / "Proceed to 10.7.7.1 (unsafe)"_
+
+## Changes
+- After doing some changes you usually must...
+  * rebuild the image(s): \
+    `$ ./scripts/compose build [containername]`
+  * restart changes image(s): \
+    `$ ./scripts/compose up -d`
\ No newline at end of file
diff --git a/mod/core/web/bigbluebutton.properties b/mod/core/web/bigbluebutton.properties
index 5791073..2af6d9f 100644
--- a/mod/core/web/bigbluebutton.properties
+++ b/mod/core/web/bigbluebutton.properties
@@ -297,7 +297,11 @@ beans.presentationService.testPresentationName=appkonference
 # Uploaded presentation file
 beans.presentationService.testUploadedPresentation=appkonference.txt
 # Default Uploaded presentation file
+{{ if isTrue .Env.DEV_MODE }}
+beans.presentationService.defaultUploadedPresentation=https://test.bigbluebutton.org/default.pdf
+{{else}}
 beans.presentationService.defaultUploadedPresentation=${bigbluebutton.web.serverURL}/default.pdf
+{{end}}
 
 presentationBaseURL=${bigbluebutton.web.serverURL}/bigbluebutton/presentation
 
diff --git a/mod/html5/entrypoint.sh b/mod/html5/entrypoint.sh
index 08be159..4bbb8d7 100755
--- a/mod/html5/entrypoint.sh
+++ b/mod/html5/entrypoint.sh
@@ -8,6 +8,11 @@ export ENVIRONMENT_TYPE=production
 export PORT=3000
 export LANG=en_US.UTF-8
 
+if [ "$DEV_MODE" == true ]; then
+    echo "DEV_MODE=true, disable TLS certificate rejecting"
+    export NODE_TLS_REJECT_UNAUTHORIZED=0
+fi
+
 rm -f /app/programs/server/assets/app/config/settings.yml
 dockerize \
     -template /app/programs/server/assets/app/config/settings.yml.tmpl:/app/programs/server/assets/app/config/settings.yml \