diff --git a/config/default.js b/config/default.js
index 8f8ece1..a09d678 100755
--- a/config/default.js
+++ b/config/default.js
@@ -100,6 +100,7 @@ module.exports = {
 	letters: {
 		length: 9,
 		timeout: 60,
+		consonantBias: 0.6, // for auto fill
 		// http://www.thecountdownpage.com/letters.htm
 		vowels: {
 			a: 15,
diff --git a/src/games/letters.js b/src/games/letters.js
index 10bf45f..b83bae9 100755
--- a/src/games/letters.js
+++ b/src/games/letters.js
@@ -157,7 +157,7 @@ function onCommand(args, context) {
 	}
 
 	if (context.command === 'letsgo' || ['start', 'go', 'auto', 'random'].includes(context.subcommand)) {
-		start(context, Array.from({ length: config.letters.length }, () => (Math.random() < 0.55 ? 'c' : 'v')).join('')); // a slight bias towards consonants seems to give better boards
+		start(context, Array.from({ length: config.letters.length }, () => (Math.random() < config.letters.consonantBias ? 'c' : 'v')).join('')); // a slight bias towards consonants seems to give better boards
 		return;
 	}