diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..f80edd0
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,9 @@
+# Set the default behavior, in case people don't have core.autocrlf set.
+* text=auto
+
+# Declare files that will always have CRLF line endings on checkout.
+testlog_1.txt text eol=lf
+testlog_no_newline_at_eof.txt text eol=lf
+
+# Declare DER keys and certs as binary
+*.der binary