diff --git a/readme.md b/readme.md
index 88a4240..7bcbac8 100644
--- a/readme.md
+++ b/readme.md
@@ -203,7 +203,7 @@ Options for creating a Graph/Data file:
 
 These files do not have a human-readable structure, and are not portable to other programs.
 
-(For portability to other software, turn on GraphML output in the Options menu in interactive mode, or use the -graphml
+(For portability to other software, turn on GraphML output in the Options menu in interactive mode, or use the `-graphml`
 command line argument. This will produce a .graphml file for the weighted graph, with 
 vertex attributes for sequence, type, and occupancy data.)