diff --git a/readme.md b/readme.md
index 7eee6c3..5b05c33 100644
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+++ b/readme.md
@@ -104,7 +104,7 @@ The program's caching behavior can be controlled in the Options menu. By default
 
 The program can optionally output Graph/Data files in .GraphML format (.graphml) for data portability. This can be 
 turned on in the Options menu. By default, GraphML output is OFF.
-
+---
 #### Cell Sample Files
 Cell Sample files consist of any number of distinct "T cells." Every cell contains 
 four sequences: Alpha CDR3, Beta CDR3, Alpha CDR1, Beta CDR1. The sequences are represented by