diff --git a/.scripts/tools/getbib b/.scripts/tools/getbib
index bf02694..ed441c5 100755
--- a/.scripts/tools/getbib
+++ b/.scripts/tools/getbib
@@ -1,21 +1,14 @@
 #!/bin/sh
+[ -z "$1" ] && echo "Give either a pdf file or a DOI as an argument." && exit
 
-# Give this script a .pdf and it will attempt
-# to return a proper .bib citation via doi.
-# Internet connection required.
-
-if [ -f "$1" ];
-then
-	# Get the doi from metadata, if not possible, get
-	# doi from pdftotext output, if not possible, exit.
+if [ -f "$1" ]; then
+	# Try to get DOI from pdfinfo or pdftotext output.
 	doi=$(pdfinfo "$1" | grep -io "doi:.*") ||
-	doi=$(pdftotext "$1" 2>/dev/null - | grep -o "doi:.*" -m 1) ||
+	doi=$(pdftotext "$1" 2>/dev/null - | grep -io "doi:.*" -m 1) ||
 	exit 1
 else
-	# If not given file, assume argument is doi
 	doi="$1"
 fi
 
 # Check crossref.org for the bib citation.
-curl -s "http://api.crossref.org/works/$doi/transform/application/x-bibtex" -w "\\n" |
-	sed -e "/^[^\\(\\t\\|@\\|}\\)]/d"
+curl -s "http://api.crossref.org/works/$doi/transform/application/x-bibtex" -w "\\n"