diff --git a/remove_all.c b/remove_all.c
index 77a4db0..c8d6889 100644
--- a/remove_all.c
+++ b/remove_all.c
@@ -29,3 +29,5 @@ int remove_all(const char * const p) {
     return 0;
     #undef NOPENFD
 }
+
+// The contents of this file are Public Domain.
diff --git a/remove_all.h b/remove_all.h
index 14f2a15..2c218b1 100644
--- a/remove_all.h
+++ b/remove_all.h
@@ -6,4 +6,6 @@
  */
 int remove_all(const char * const p);
 
+// The contents of this file are Public Domain.
+
 #endif