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-rw-r--r--ports/sysdeps/arm/arm-features.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/ports/sysdeps/arm/arm-features.h b/ports/sysdeps/arm/arm-features.h
index 0f99b3ab81..41befb57f5 100644
--- a/ports/sysdeps/arm/arm-features.h
+++ b/ports/sysdeps/arm/arm-features.h
@@ -31,4 +31,9 @@
 # define ARM_HAVE_VFP	1
 #endif
 
+/* An OS-specific arm-features.h file may define ARM_ASSUME_NO_IWMMXT
+   to indicate at compile time that iWMMXt hardware is never present
+   at runtime (or that we never care about its state) and so need not
+   be checked for.  */
+
 #endif  /* arm-features.h */