diff --git a/Makefile b/Makefile
index 6db4239..d8938c7 100644
--- a/Makefile
+++ b/Makefile
@@ -7,4 +7,4 @@ pdftotext:
 	@find ./data -not \( -path ./data/text -prune \) -iname '*.txt' -exec mv {} './data/text/' ';'
 
 extract:
-	@perl extract_urls.pl data/text/*.txt
+	@perl extract_urls.pl data/text/*.txt > $$(date +"output/links-%FT%T.txt")