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diff --git a/README.md b/README.md
index de2f5e7..3f11ac1 100644
--- a/README.md
+++ b/README.md
@@ -21,10 +21,12 @@ g++ main.cpp -o circgraph
 
 `circgraph` takes input from stdin in the following format:
 
+```
 <source_node> <sink_node>
 <node1> [<neighbor1> <resistance2>]...
 <node2>
 ...
 <noden>
+```
 
 See the `testX.txt` files for more.