diff --git a/examples/i2c_oled/README.md b/examples/i2c_oled/README.md
index facc372c93fcf37bdaaaa47a73731e704bc6cd08..56479fb1a9af5943202342c72f59f07281bdb02d 100644
--- a/examples/i2c_oled/README.md
+++ b/examples/i2c_oled/README.md
@@ -10,31 +10,38 @@ different graphic screens to test out the various drawing primitives.
 https://user-images.githubusercontent.com/1132011/230734071-dee305de-5aad-4ca0-a422-5fb31d2bb0e0.mp4
 
 ## Build options
-There are a few build-time options in the i2c.h source:
-* I2C_CLKRATE - defines the I2C bus clock rate. Both 100kHz and 400kHz are supported.
-800kHz has been seen to work when I2C_PRERATE is 1000000, but 1MHz did not. To
-use higher bus rates you must increase I2C_PRERATE at the expense of higher power
-consumption.
-* I2C_PRERATE - defines the I2C logic clock rate. Must be higher than I2C_CLKRATE.
-Keep this value as low as possible (but not lower than 1000000) to ensure low power
-operaton.
-* I2C_DUTY - for I2C_CLKRATE > 100kHz this specifies the duty cycle, either 33% or 36%.
-* TIMEOUT_MAX - the amount of tries in busy-wait loops before giving up. This value
-depends on the I2C_CLKRATE and should not affect normal operation.
-* I2C_IRQ - chooses IRQ-based operation instead of busy-wait polling. Useful to
-free up CPU resources but should be used carefully since it has more potential
-mysterious effects and less error checking.
+There are a few build-time options in the i2c.h source - 
+
+In i2c_oled.c:
+* SSD1306_64X32, SSD1306_128X32, SSD1306_128X64 - choose only one of these
+depending on the type of OLED you've got.
+
+In ssd1306.h
+* SSD1306_PSZ - the number of bytes to send per I2C data packet. The default value
+of 32 seems to work well. Smaller values are allowed but may result in slower
+refresh rates.
+
+In ssd1306_i2c.h
+* SSD1306_I2C_ADDR - the I2C address of your OLED display. The default is 0x3c
+which should work for most devices. Use 0x3d if you've pulled the SA0 line high.
+* SSD1306_I2C_CLKRATE - defines the I2C bus clock rate. Both 100kHz and 400kHz
+are supported. 800kHz has been seen to work when I2C_PRERATE is 1000000, but 1MHz
+did not. To use higher bus rates you must increase I2C_PRERATE at the expense of
+higher power consumption.
+* SSD1306_I2C_PRERATE - defines the I2C logic clock rate. Must be higher than
+I2C_CLKRATE. Keep this value as low as possible (but not lower than 1000000) to
+ensure low power operaton.
+* SSD1306_I2C_DUTY - for I2C_CLKRATE > 100kHz this specifies the duty cycle,
+either 33% or 36%.
+* TIMEOUT_MAX - the amount of tries in busy-wait loops before giving up. This
+value depends on the I2C_CLKRATE and should not affect normal operation.
+* SSD1306_I2C_IRQ - chooses IRQ-based operation instead of busy-wait polling.
+Useful to free up CPU resources but should be used carefully since it has more
+potential mysterious effects and less error checking.
 * IRQ_DIAG - enables timing analysis via GPIO toggling. Don't enable this unless
 you know what you're doing.
 
 There are a few build-time options in the oled.h source:
-* OLED_ADDR - the I2C address of your OLED display. The default is 0x3c which
-should work for most devices. Use 0x3d if you've pulled the SA0 line high.
-* OLED_PSZ - the number of bytes to send per I2C data packet. The default value
-of 32 seems to work well. Smaller values are allowed but may result in slower
-refresh rates.
-* OLED_64X32, OLED_128X32, OLED_128X64 - choose only one of these depending on
-the type of OLED you've got.
 
 ## Use
 Connect an SSD1306-based OLED in I2C interface mode to pins PC1 (SDA) and PC2 (SCL)