diff --git a/writestring.go b/writestring.go
new file mode 100644
index 0000000..c378a96
--- /dev/null
+++ b/writestring.go
@@ -0,0 +1,21 @@
+package raft
+
+import (
+	"io"
+
+	"sourcecode.social/reiver/go-erorr"
+)
+
+// writeString is similar to io.WriteString(), except that if the number of bytes written (by io.WriteString()) is not 'len(str)' then it returns an error.
+func writeString(writer io.Writer, str string) error {
+
+	n, err := io.WriteString(writer, str)
+	if nil != err {
+		return erorr.Errorf("problem writing string: %w", err)
+	}
+	if expected, actual := len(str), n ; expected != actual {
+		return erorr.Errorf("expected to write %d bytes but actually wrote %d bytes", expected, actual)
+	}
+
+	return nil
+}