diff --git a/README.md b/README.md
index 78edac9d12c13..26613314a15bc 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ by running it with the `--help` flag or reading the [rustc dev guide][rustcguide
     If you plan to use `x.py install` to create an installation, it is recommended
     that you set the `prefix` value in the `[install]` section to a directory.
 
-    Create install directory if you are not installing in default directory
+    Create install directory if you are not installing in default directory.
 
 4. Build and install: