diff --git a/cheatsheets/gs b/cheatsheets/gs
new file mode 100644
index 0000000..a62ac97
--- /dev/null
+++ b/cheatsheets/gs
@@ -0,0 +1,3 @@
+# To reduce the size of a pdf file:
+gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=output.pdf input.pdf
+