diff --git a/.gitattributes b/.gitattributes
new file mode 100644
index 0000000..d74e4a8
--- /dev/null
+++ b/.gitattributes
@@ -0,0 +1,7 @@
+# Auto-detect text files and normalize them to LF in the working tree on
+# checkout, regardless of each contributor's global git config.
+* text=auto eol=lf
+
+# Shell scripts must use LF line endings — a CRLF on the shebang line makes
+# the kernel look for "/bin/bash\r" and fail with "bad interpreter".
+*.sh text eol=lf