diff --git a/docs/porting.rst b/docs/porting.rst
index db4ae76262..6cd59fefb1 100644
--- a/docs/porting.rst
+++ b/docs/porting.rst
@@ -51,10 +51,15 @@ as a natural "TODO" list. An example minimal build list is shown below:
 .. code-block:: makefile
 
     # These modules are implemented in ports/<port>/common-hal:
-    CIRCUITPY_MICROCONTROLLER = 0 # Typically the first module to create
-    CIRCUITPY_DIGITALIO = 0       # Typically the second module to create
+
+    # Typically the first module to create
+    CIRCUITPY_MICROCONTROLLER = 0
+    # Typically the second module to create
+    CIRCUITPY_DIGITALIO = 0
+    # Other modules:
     CIRCUITPY_ANALOGIO = 0
     CIRCUITPY_BUSIO = 0
+    CIRCUITPY_COUNTIO = 0
     CIRCUITPY_NEOPIXEL_WRITE = 0
     CIRCUITPY_PULSEIO = 0
     CIRCUITPY_OS = 0
@@ -63,22 +68,34 @@ as a natural "TODO" list. An example minimal build list is shown below:
     CIRCUITPY_AUDIOIO = 0
     CIRCUITPY_ROTARYIO = 0
     CIRCUITPY_RTC = 0
+    CIRCUITPY_SDCARDIO = 0
+    CIRCUITPY_FRAMEBUFFERIO = 0
     CIRCUITPY_FREQUENCYIO = 0
     CIRCUITPY_I2CPERIPHERAL = 0
-    CIRCUITPY_DISPLAYIO = 0       # Requires SPI, PulseIO (stub ok)
+    # Requires SPI, PulseIO (stub ok):
+    CIRCUITPY_DISPLAYIO = 0
 
     # These modules are implemented in shared-module/ - they can be included in
     # any port once their prerequisites in common-hal are complete.
-    CIRCUITPY_BITBANGIO = 0       # Requires DigitalIO
-    CIRCUITPY_GAMEPAD = 0         # Requires DigitalIO
-    CIRCUITPY_PIXELBUF = 0        # Requires neopixel_write or SPI (dotstar)
-    CIRCUITPY_RANDOM = 0          # Requires OS
-    CIRCUITPY_STORAGE = 0         # Requires OS, filesystem
-    CIRCUITPY_TOUCHIO = 0         # Requires Microcontroller
-    CIRCUITPY_USB_HID = 0         # Requires USB
-    CIRCUITPY_USB_MIDI = 0        # Requires USB
-    CIRCUITPY_REQUIRE_I2C_PULLUPS = 0 # Does nothing without I2C
-    CIRCUITPY_ULAB = 0            # No requirements, but takes extra flash
+    # Requires DigitalIO:
+    CIRCUITPY_BITBANGIO = 0
+    # Requires DigitalIO
+    CIRCUITPY_GAMEPAD = 0
+    # Requires neopixel_write or SPI (dotstar)
+    CIRCUITPY_PIXELBUF = 0
+    # Requires OS
+    CIRCUITPY_RANDOM = 0
+    # Requires OS, filesystem
+    CIRCUITPY_STORAGE = 0
+    # Requires Microcontroller
+    CIRCUITPY_TOUCHIO = 0
+    # Requires USB
+    CIRCUITPY_USB_HID = 0
+    CIRCUITPY_USB_MIDI = 0
+    # Does nothing without I2C
+    CIRCUITPY_REQUIRE_I2C_PULLUPS = 0
+    # No requirements, but takes extra flash
+    CIRCUITPY_ULAB = 0
 
 Step 2: Init
 --------------
diff --git a/ports/esp32s2/mpconfigport.mk b/ports/esp32s2/mpconfigport.mk
index 152e5c8030..3ddcf5d613 100644
--- a/ports/esp32s2/mpconfigport.mk
+++ b/ports/esp32s2/mpconfigport.mk
@@ -25,8 +25,9 @@ CIRCUITPY_COUNTIO = 0
 
 # These modules are implemented in shared-module/ - they can be included in
 # any port once their prerequisites in common-hal are complete.
-CIRCUITPY_RANDOM = 0          # Requires OS
-CIRCUITPY_USB_MIDI = 0        # Requires USB
-CIRCUITPY_ULAB = 1            # No requirements, but takes extra flash
+# Requires OS
+CIRCUITPY_RANDOM = 0
+# Requires USB
+CIRCUITPY_USB_MIDI = 0
 
 CIRCUITPY_MODULE ?= none
diff --git a/ports/stm/boards/espruino_pico/mpconfigboard.mk b/ports/stm/boards/espruino_pico/mpconfigboard.mk
index 201237c9d6..b1b023dd58 100644
--- a/ports/stm/boards/espruino_pico/mpconfigboard.mk
+++ b/ports/stm/boards/espruino_pico/mpconfigboard.mk
@@ -10,7 +10,8 @@ MCU_VARIANT = STM32F401xE
 MCU_PACKAGE = UFQFPN48
 
 LD_COMMON = boards/common_default.ld
-LD_FILE = boards/STM32F401xd_fs.ld # use for internal flash
+# use for internal flash
+LD_FILE = boards/STM32F401xd_fs.ld
 
 # Disable ulab as we're nearly out of space on this board due to
 # INTERNAL_FLASH_FILESYSTEM.  It can probably be reenabled if we enable
diff --git a/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
index 2b2c0d6db5..4d0bd4598d 100644
--- a/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
+++ b/ports/stm/boards/feather_stm32f405_express/mpconfigboard.mk
@@ -13,5 +13,6 @@ MCU_PACKAGE = LQFP64
 
 LD_COMMON = boards/common_default.ld
 LD_DEFAULT = boards/STM32F405_default.ld
-LD_BOOT = boards/STM32F405_boot.ld # UF2 boot option
+# UF2 boot option
+LD_BOOT = boards/STM32F405_boot.ld
 UF2_OFFSET = 0x8010000
diff --git a/ports/stm/boards/meowbit_v121/mpconfigboard.mk b/ports/stm/boards/meowbit_v121/mpconfigboard.mk
index 852836ef8f..a638183019 100644
--- a/ports/stm/boards/meowbit_v121/mpconfigboard.mk
+++ b/ports/stm/boards/meowbit_v121/mpconfigboard.mk
@@ -18,4 +18,5 @@ OPTIMIZATION_FLAGS = -Os
 
 LD_COMMON = boards/common_default.ld
 LD_FILE = boards/STM32F401xe_boot.ld
-# LD_FILE = boards/STM32F401xe_fs.ld # use for internal flash
+# use for internal flash
+# LD_FILE = boards/STM32F401xe_fs.ld