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diff --git a/README b/README
index e57fb8f..85b3aba 100644
--- a/README
+++ b/README
@@ -64,5 +64,6 @@ References
 - ping:
   - https://www.geeksforgeeks.org/ping-in-c/
   - Stevens Network Programming, Vol. 1
+  - OpenBSD ping.c
       
 [1] http://www.musl-libc.org/