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+---
+title: fmt.Warnf
+linkTitle: warnf
+description: Log a WARNING from a template.
+categories: [functions]
+keywords: []
+menu:
+  docs:
+    parent: functions
+function:
+  aliases: [warnf]
+  returnType: string
+  signatures: ['fmt.Warnf FORMAT [INPUT]']
+relatedFunctions:
+  - fmt.Errorf
+  - fmt.Erroridf
+  - fmt.Warnf
+aliases: [/functions/warnf]
+---
+
+The documentation for [Go's fmt package] describes the structure and content of the format string.
+
+Like the  [`printf`] function, the `warnf` function evaluates the format string. It then prints the result to the WARNING log. Hugo prints each unique message once to avoid flooding the log with duplicate warnings.
+
+```go-html-template
+{{ warnf "Copyright notice missing from site configuration" }}
+```
+
+[`printf`]: /functions/fmt/printf
+[Go's fmt package]: https://pkg.go.dev/fmt