diff --git a/Makefile b/Makefile
index 8750d4e..1ed2042 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ CFILES = $(wildcard *.c)
 OBJECTS = $(CFILES:.c=.o)
 BIN = bme680
 
-all: spi i2c
+all: spi i2c log
 
 log: $(OBJECTS)
 	@echo ">>> $(BIN)_log_spi"
diff --git a/README.md b/README.md
index d33bd0e..9f0b960 100644
--- a/README.md
+++ b/README.md
@@ -15,9 +15,18 @@ Connecting the purple BME680 module board to SPI:
 | CS       | "CS"       | GPIO 8 (Pin 24)  |
 
 ### build
-Run `make` to build demo programs `bme680_spi` and `bme680_i2c` that use the pins/dev configured in `spi.c` and `i2c.c`
+```sh
+$ make
+```
+This will create demo programs `bme680_i2c` and `bme680_spi`, and logging programs `bme680_log_i2c` and `bme680_log_spi`. They all expect the pin/devices specified in `spi.c` and `i2c.c`.
 
-Also `make log` creates spi and i2c versions of the log program
+The loggers spit out the following every minute:
+```
+2024-08-19T18:20:00+0100 22.2358 101068 65.8092 11054.4 1
+```
+`Date`, `Temperature °C`, `Pressure Pa`, `% RH`, `Measured Gas resistance Ω`, `Heat stability bit`
+
+>Note: disregard measured gas resistance if the heat stability bit is not 1.
 
 ## spi demo
 ```