diff --git a/.pre-commit b/.pre-commit
new file mode 100755
index 0000000..3cab5c3
--- /dev/null
+++ b/.pre-commit
@@ -0,0 +1,52 @@
+#!/bin/sh
+#
+# An example hook script to verify what is about to be committed.
+# Called by "git commit" with no arguments.  The hook should
+# exit with non-zero status after issuing an appropriate message if
+# it wants to stop the commit.
+#
+# To enable this hook, rename this file to "pre-commit".
+
+if git rev-parse --verify HEAD >/dev/null 2>&1
+then
+	against=HEAD
+else
+	# Initial commit: diff against an empty tree object
+	against=$(git hash-object -t tree /dev/null)
+fi
+
+# If you want to allow non-ASCII filenames set this variable to true.
+allownonascii=$(git config --type=bool hooks.allownonascii)
+
+# Redirect output to stderr.
+exec 1>&2
+
+# Cross platform projects tend to avoid non-ASCII filenames; prevent
+# them from being added to the repository. We exploit the fact that the
+# printable range starts at the space character and ends with tilde.
+if [ "$allownonascii" != "true" ] &&
+	# Note that the use of brackets around a tr range is ok here, (it's
+	# even required, for portability to Solaris 10's /usr/bin/tr), since
+	# the square bracket bytes happen to fall in the designated range.
+	test $(git diff --cached --name-only --diff-filter=A -z $against |
+	  LC_ALL=C tr -d '[ -~]\0' | wc -c) != 0
+then
+	cat <<\EOF
+Error: Attempt to add a non-ASCII file name.
+
+This can cause problems if you want to work with people on other platforms.
+
+To be portable it is advisable to rename the file.
+
+If you know what you are doing you can disable this check using:
+
+  git config hooks.allownonascii true
+EOF
+	exit 1
+fi
+
+# If there are whitespace errors, print the offending file names and fail.
+exec git diff-index --check --cached $against --
+
+# Run clean on all txt files
+./cleanfile *.txt
diff --git a/README.md b/README.md
index 134e531..ead7503 100644
--- a/README.md
+++ b/README.md
@@ -13,3 +13,7 @@ This is my collection of (possible) hostnames for computers. Hostnames are store
 And there is my personal
 
 * [main](main.txt)
+
+## Install pre-commit hooks
+
+    ln -s .pre-commit .git/hooks/pre-commit
diff --git a/cleanfile.sh b/cleanfile
similarity index 100%
rename from cleanfile.sh
rename to cleanfile
diff --git a/main.txt b/main.txt
index f1d4ff4..049487c 100644
--- a/main.txt
+++ b/main.txt
@@ -92,6 +92,7 @@ pumba
 quill
 rapture
 ratter
+raven
 ravenger
 razor
 rocket