From 6e4a89c07636f139e6557c0fc7180f441d216f05 Mon Sep 17 00:00:00 2001
From: Christian Deacon <gamemann@gflclan.com>
Date: Thu, 21 May 2020 01:19:28 +0000
Subject: [PATCH] Updated README.

---
 README.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/README.md b/README.md
index 37f9aea..7b31ddc 100644
--- a/README.md
+++ b/README.md
@@ -132,5 +132,20 @@ cd XDP-Firewall
 make && make install
 ```
 
+## Notes
+### BPF For/While Loop Support
+This project requires for/while loop support with BPF. Older kernels will not support this and output an error such as:
+
+```
+libbpf: load bpf program failed: Invalid argument
+libbpf: -- BEGIN DUMP LOG ---
+libbpf:
+back-edge from insn 113 to 100
+
+libbpf: -- END LOG --
+libbpf: failed to load program 'xdp_prog'
+libbpf: failed to load object '/etc/xdpfw/xdpfw_kern.o'
+```
+
 ## Credits
 * [Christian Deacon](https://www.linkedin.com/in/christian-deacon-902042186/) - Creator.
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