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-rw-r--r--lib/arch/arch.nim3
1 files changed, 3 insertions, 0 deletions
diff --git a/lib/arch/arch.nim b/lib/arch/arch.nim
index a11bfb21f..c8ae3da1c 100644
--- a/lib/arch/arch.nim
+++ b/lib/arch/arch.nim
@@ -6,6 +6,9 @@
 #    See the file "copying.txt", included in this
 #    distribution, for details about the copyright.
 #
+# Architecture-specific optimizations and features.
+# arch.nim can be imported by only a subset of the
+# architectures supported by Nim.
 
 when defined(windows):
   const