diff --git a/Sensor-API.md b/Sensor-API.md
index 8dd86a92..8b0f1a27 100644
--- a/Sensor-API.md
+++ b/Sensor-API.md
@@ -1,15 +1,13 @@
-# Sensor API
+This wiki page is an attempt to document the Tasmota sensor API for sensor driver development.
 
-This wiki page is an attempt to document the sensor API for sensor driver development.
-
-## File structure
+# File structure
 Sensor libraries are located in the `lib/` directory. Sensor drivers are located in the `sonoff/` directory. The filename of the sensor driver is `xsns_<driver_ID>_<driver_name>.ino`, e.g. `xsns_05_ds18b20.ino` where `<driver_ID>` is a _unique_ number between 01 and 90 and `<driver_name>` is a human-readable name of the driver.
 
-## API structure
-### Pre-processor directives
+# API structure
+## Pre-processor directives
 Conditional compiling of a sensor driver is achieved by commenting/uncommenting a pre-processor directive of the scheme `USE_<driver_name>` in `user_config.h`. Accordingly the driver code has to be wrapped in `#ifdef USE_<driver_name> ... #endif  // USE_<driver_name>`. Any Sensor driver must contain a pre-processor directive defining the driver ID by the scheme `#define XSNS_<driver_ID>`.
 
-### Callback function
+## Callback function
 Any sensor driver needs a callback function following the scheme
 ```
 /**
@@ -45,85 +43,87 @@ boolean Xsns<driverID>(byte callback_id)
 ```
 
 
-### Callback IDs
+## Callback IDs
 
-#### FUNC_PRE_INIT
+### FUNC_PRE_INIT
 ???
-#### FUNC_INIT
+
+### FUNC_INIT
 This callback ID is called when sensor drivers should be initialized.
 
-#### FUNC_LOOP
+### FUNC_LOOP
 ???
-#### FUNC_EVERY_50_MSECOND
+
+### FUNC_EVERY_50_MSECOND
 This callback ID is called every 50 milliseconds, e.g. for near real-time operation
 
-#### FUNC_EVERY_SECOND
+### FUNC_EVERY_SECOND
 This callback ID is called every second.
 
-#### FUNC_PREP_BEFORE_TELEPERIOD
+### FUNC_PREP_BEFORE_TELEPERIOD
 ???
 
-#### FUNC_JSON_APPEND
+### FUNC_JSON_APPEND
 This callback ID is called when `TELEPERIOD` is due to append telemetry data to the MQTT JSON string, e.g.
 ```
 snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"MPR121%c\":{\"Button%i\":%i}}"), pS->id[i], j, BITC(i,j));
 ```
 
-#### FUNC_WEB_APPEND
+### FUNC_WEB_APPEND
 This callback ID is called when HTML code should be added to the Tasmota web-interface main page, e.g.
 ```
 snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("%s{s}MPR121%c Button%d{m}%d{e}"), mqtt_data, pS->id[i], j, BITC(i,j));
 ```
 It should be wrapped in `#ifdef USE_WEBSERVER ... #endif  // USE_WEBSERVER`
 
-#### FUNC_SAVE_BEFORE_RESTART
+### FUNC_SAVE_BEFORE_RESTART
 ???
 
-#### FUNC_COMMAND
+### FUNC_COMMAND
 ???
 
-#### FUNC_MQTT_SUBSCRIBE
+### FUNC_MQTT_SUBSCRIBE
 ???
 
-#### FUNC_MQTT_INIT
+### FUNC_MQTT_INIT
 ???
 
-#### FUNC_MQTT_DATA
+### FUNC_MQTT_DATA
 ???
 
-#### FUNC_SET_POWER
+### FUNC_SET_POWER
 ???
 
-#### FUNC_SHOW_SENSOR
+### FUNC_SHOW_SENSOR
 ???
 
-#### FUNC_RULES_PROCESS
+### FUNC_RULES_PROCESS
 ???
 
-#### FUNC_FREE_MEM
+### FUNC_FREE_MEM
 ???
 
-### Useful functions
+## Useful functions
 
-#### void MqttPublishPrefixTopic_P(uint8_t prefix, const char* subtopic, boolean retained)
+### void MqttPublishPrefixTopic_P(uint8_t prefix, const char* subtopic, boolean retained)
 This function publishes MQTT messages immediately, e.g.
 ```
 snprintf_P(mqtt_data, sizeof(mqtt_data), PSTR("{\"MPR121%c\":{\"Button%i\":%i}}"), pS->id[i], j, BITC(i,j));
 MqttPublishPrefixTopic_P(RESULT_OR_STAT, mqtt_data);
 ```
-#### void AddLog(byte loglevel)
+### void AddLog(byte loglevel)
 ```
 snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_I2C "MPR121(%c) " D_FOUND_AT " 0x%X"), pS->id[i], pS->i2c_addr[i]);
 AddLog(LOG_LEVEL_INFO);
 ```
-#### void AddLogSerial(byte loglevel)
+### void AddLogSerial(byte loglevel)
 ```
 snprintf_P(log_data, sizeof(log_data), PSTR(D_LOG_I2C "MPR121(%c) " D_FOUND_AT " 0x%X"), pS->id[i], pS->i2c_addr[i]);
 AddLogSerial(LOG_LEVEL_INFO);
 ```
-#### void AddLogMissed(char *sensor, uint8_t misses)
+### void AddLogMissed(char *sensor, uint8_t misses)
 ???
 
-### Useful pre-processor directives
-### `PSTR("string")`
+## Useful pre-processor directives
+### PSTR("string")
 This pre-processor directive save RAM by storing strings in flash instead of RAM
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