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-rw-r--r--ports/sysdeps/arm/arm-features.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/ports/sysdeps/arm/arm-features.h b/ports/sysdeps/arm/arm-features.h
index 5104ba3329..336b6905af 100644
--- a/ports/sysdeps/arm/arm-features.h
+++ b/ports/sysdeps/arm/arm-features.h
@@ -53,4 +53,7 @@
 # define ARM_BX_ALIGN_LOG2	2
 #endif
 
+/* An OS-specific arm-features.h file may define ARM_NO_INDEX_REGISTER to
+   indicate that the two-register addressing modes must never be used.  */
+
 #endif  /* arm-features.h */