diff --git a/README.md b/README.md
index 1ce1a29..0b914f8 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,7 @@ Code for Pat's dissertation.
 sorter.rb takes the following options:
 
 | option          | usage                                              | 
+| --------------- | -------------------------------------------------- |
 | -f, --file      | the name of the input file                         |
 | -b, --bin-file  | the name of the bin csv file                       |
 | -t, --type      | what type of splitting to do, can be "iat" or "pn" |