diff --git a/docs/troubleshooting.md b/docs/troubleshooting.md
index e69de29..7156c3d 100644
--- a/docs/troubleshooting.md
+++ b/docs/troubleshooting.md
@@ -0,0 +1,19 @@
+---
+
+# 16. docs/troubleshooting.md
+
+```markdown
+# Troubleshooting Guide
+
+## Prometheus Target Down
+
+### Symptoms
+
+Prometheus shows target as DOWN.
+
+### Checks
+
+```bash
+ping TARGET_IP
+curl http://TARGET_IP:9100/metrics
+systemctl status prometheus-node-exporter
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