diff --git a/README.md b/README.md
index 5acf7a6..a5118c3 100644
--- a/README.md
+++ b/README.md
@@ -11,6 +11,7 @@ installed with `pip`.
 
 * pysat
 * tqdm
+* rich
 
 
 ## Usage
diff --git a/uio.py b/uio.py
index 7a31ea7..844768b 100644
--- a/uio.py
+++ b/uio.py
@@ -238,7 +238,7 @@ for base in bases:
     for i in range(length):
       for a in alphabet:
         if avar(i, a) in truth:
-          console.print(a, end=' ', style='bold')
+          console.print(a, end=' ', style='bold green')
     console.print('')
 
     # For each state, we print the paths and output.