diff --git a/Makefile b/Makefile
index 109435a..5c29f50 100644
--- a/Makefile
+++ b/Makefile
@@ -4,3 +4,6 @@ help:
 pdftotext:
 	@find ./data -iname '*.pdf' -execdir pdftotext {} \;
 	@find ./data -not \( -path ./data/text -prune \) -iname '*.txt' -exec mv {} './data/text/' ';'
+
+extract:
+	@perl extract_urls.pl data/text/*.txt