diff --git a/docs/REST-API.md b/docs/REST-API.md
index 3b18e5f..0f09a52 100644
--- a/docs/REST-API.md
+++ b/docs/REST-API.md
@@ -7,61 +7,115 @@ To use it, just append them to the IP, separated with a `/`, eg. `http://192.168
 
 ## Control
 * ### flow_start
+  Trigger a flow start (if not running)
 
 * ### gpio
-  The `gpio` entrypoint also support parameters:
-   - `/GPIO?GPIO=12&Status=high`
+  Control a GPIO output
+  - The `gpio` entrypoint also support parameters:
+    - `/GPIO?GPIO={PinNumber}&Status=high`
+    - `/GPIO?GPIO={PinNumber}&Status=low`
+  - Example: `/GPIO?GPIO=12&Status=high`
+
+  Read a GPIO input
+  - The `gpio` entrypoint also support parameters:
+    - `/GPIO?GPIO={PinNumber}`
+  - Example: `/GPIO?GPIO=12`
 
 * ### ota
 
 * ### ota_page.html
+  Opens the Over-The-Air update html page
 
 * ### reboot
+  Trigger a reboot of the device
 
 ## Results
 * ### json
+  Show result in JSON syntax
+  - Example: 
+  `{
+  "main":
+    {
+      "value": "521.17108",
+      "raw": "521.17108",
+      "pre": "521.17108",
+      "error": "no error",
+      "rate": "0.023780",
+      "timestamp": "2023-01-13T16:00:42+0100"
+    }
+  }`
 
 * ### value
-  The `value` entrypoint also support parameters:
+  Show single result values
+  - The `value` entrypoint also support parameters:
    - `http://<IP>/value?all=true&type=value`
    - `http://<IP>/value?all=true&type=raw`
    - `http://<IP>/value?all=true&type=error`
    - `http://<IP>/value?all=true&type=prevalue`
 
+* ### img_tmp/raw.jpg
+  Capture and show a new raw image
+
+* ### img_tmp/roi.jpg
+  Show last aligned image
+
 * ### img_tmp/alg_roi.jpg
-  Last captured picture
+  Show last aligned image incuding ROI overlay
 
 ## Status
 * ### statusflow
+  Show the actual step of the flow incl. timestamp
+  - Example: `Take Image (15:56:34)`
 
 * ### rssi
+  Show the WIFI signal strength
+  - Example: `-51dBm`
 
 * ### cpu_temperature
+  Show the CPU temperature
+  - Example: `38.5 °C`
 
 * ### sysinfo
+  Show system infos in JSON syntax
+  - Example: `[ { "firmware" : "xxx", "buildtime" : "2023-01-15 21:27", "gitbranch" : "xxx", "gittag" : "", "gitrevision" : "a5e533f+", "html" : "Development-Branch: xxx (Commit: a5e533f+)", "cputemp" : "67.777779", "hostname" : "xxx", "IPv4" : "192.168.xxx.xxx", "freeHeapMem" : "2789466" } ]`
 
 * ### starttime
+  Show starttime
+  - Example: `20230113-154634`
 
 * ### uptime
+  Show uptime
+  - Example: `0d 00h 15m 50s`
 
 ## Camera
 * ### lighton
+  Switch the camera flashlight on 
 
 * ### lightoff
+  Switch the camera flashlight off
 
 * ### capture
+  Capture a new image (without flashlight)
 
 * ### capture_with_flashlight
+  Capture a new image with flashlight
 
 * ### save
-  The `save` entrypoint also support parameters:
-   - `http://<IP>/save?filename=test.jpg&delay=3`
+  Save a new image to SD card
+  - The `save` entrypoint also support parameters:
+   - `http://<IP>/save?filename=test.jpg&delay=1`
 
 ## Logs
 * ### log 
-  Last part of todays log
+  Last part of todays log (last 80 kBytes))
 
 * ### logfileact 
   Full log of today
 
 * ### log.html
+  Opens the log html page
+
+## Diagnostics
+* ### heap
+  print relevant memory (heap) information
+  - Example: `Heap: 3003978 Min Free: 1413058 larg. Block: 2949120 SPI Heap: 2957579 NOT_SPI Heap: 46399 Internal Heap: 46399 Internal Min Heap free: 10523`