diff --git a/arch/z80/src/z80/README.txt b/arch/z80/src/z80/README.txt
index f816054757..f5ad20a4c1 100644
--- a/arch/z80/src/z80/README.txt
+++ b/arch/z80/src/z80/README.txt
@@ -24,7 +24,7 @@ z80_rom.asm
 
     A board specific version in the configs/<board-name>/src directory can be
     used by:
-    
+
     1. Define CONFIG_ARCH_HAVEHEAD
     2. Add the board-specific head file, say <filename>.asm, to
        configs/<board-name>/src