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-rw-r--r--include/libc.h4
-rw-r--r--include/u.h2
2 files changed, 6 insertions, 0 deletions
diff --git a/include/libc.h b/include/libc.h
index 0427dadf..af4422d1 100644
--- a/include/libc.h
+++ b/include/libc.h
@@ -1,3 +1,7 @@
+// This file originated as Plan 9's /sys/include/libc.h.
+// The plan9port-specific changes may be distributed
+// using the license in ../src/lib9/LICENSE.
+
/*
* Lib9 is miscellany from the Plan 9 C library that doesn't
* fit into libutf or into libfmt, but is still missing from traditional
diff --git a/include/u.h b/include/u.h
index 3a25d01c..5f53736f 100644
--- a/include/u.h
+++ b/include/u.h
@@ -1,3 +1,5 @@
+// See ../src/lib9/LICENSE
+
#ifndef _U_H_
#define _U_H_ 1
#if defined(__cplusplus)