diff --git a/config.def.h b/config.def.h
index e44fab1..e867817 100644
--- a/config.def.h
+++ b/config.def.h
@@ -93,6 +93,9 @@ char *termname = "st-256color";
  */
 unsigned int tabspaces = 8;
 
+/* bg opacity */
+float alpha = 0.8;
+
 /* Terminal colors (16 first used in escape sequence) */
 static const char *colorname[] = {
     /* 8 normal colors */