Fix typo.
diff --git a/docs/style-guide.txt b/docs/style-guide.txt
index 04fa5ef..ddf3ebb 100644
--- a/docs/style-guide.txt
+++ b/docs/style-guide.txt
@@ -614,7 +614,7 @@
It's considered good form to test your new feature before you submit a patch
to the mailing list, and especially before you commit a change to CVS. Here
-are some guildlines on testing your changes.
+are some guidelines on testing your changes.
- Always test busybox applets against GNU counterparts and make sure the
behavior / output is identical between the two.