diff --git a/ports/ARMCM3/port.dox b/ports/ARMCM3/port.dox
index 888f58388..e22ea3b80 100644
--- a/ports/ARMCM3/port.dox
+++ b/ports/ARMCM3/port.dox
@@ -42,7 +42,7 @@
  * - <b>Halted</b>. Implemented as an infinite loop after globally masking all
  *   the maskable interrupt sources. The ARM state is whatever the processor
  *   was running when @p chSysHalt() was invoked.
- * 
+ *
  * @section ARMCM3_NOTES The ARM Cortex-M3 port notes
  * The ARM Cortex-M3 port is organized as follow:
  * - The @p main() function is invoked in thread-privileged mode.
@@ -121,7 +121,7 @@
  *    linker script (usually named @p ch.ld). Stack areas are allocated from
  *    the highest RAM location downward.
  * -# An early initialization routine @p hwinit0 is invoked, if the symbol is
- *     notdefined then an empty default routine is executed (weak symbol).
+ *    not defined then an empty default routine is executed (weak symbol).
  * -# DATA and BSS segments are initialized.
  * -# The CPU state is switched to Privileged and the PSP stack is used.
  * -# A late initialization routine @p hwinit1 is invoked, if the symbol not