diff --git a/include/nuttx/arch.h b/include/nuttx/arch.h
index ea22e018046..2e1b145213e 100644
--- a/include/nuttx/arch.h
+++ b/include/nuttx/arch.h
@@ -53,8 +53,7 @@
  *    This chip related declarations are retained in this header file.
  *
  *    NOTE: up_ is supposed to stand for microprocessor; the u is like the
- *    Greek letter micron: µ. So it would be µP which is a common shortening
- *    of the word microprocessor.
+ *    Greek letter micron.
  *
  * 2. Microprocessor-Specific Interfaces.
  *