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-rw-r--r--rules.mk2
1 files changed, 1 insertions, 1 deletions
diff --git a/rules.mk b/rules.mk
index d575726c7..9143f9bcf 100644
--- a/rules.mk
+++ b/rules.mk
@@ -317,7 +317,7 @@ GENDEPFLAGS = -MMD -MP -MF .dep/$(@F).d
# Combine all necessary flags and optional flags.
# Add target processor to flags.
-# You can give EXTRAFLAGS at 'make' command line.
+# You can give extra flags at 'make' command line like: make EXTRAFLAGS=-DFOO=bar
ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS) $(EXTRAFLAGS)
ALL_CPPFLAGS = -mmcu=$(MCU) -I. -x c++ $(CPPFLAGS) $(GENDEPFLAGS) $(EXTRAFLAGS)
ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS) $(EXTRAFLAGS)