diff --git a/internal/util/util.go b/internal/util/util.go
index 1ff25dac..f23fb67b 100644
--- a/internal/util/util.go
+++ b/internal/util/util.go
@@ -1,5 +1,6 @@
 package util
 
+// WriterFunc is used to implement one off io.Writers.
 type WriterFunc func(p []byte) (int, error)
 
 func (f WriterFunc) Write(p []byte) (int, error) {