diff --git a/doc/foot.ini.5.scd b/doc/foot.ini.5.scd
index 0d2aa01f..e01f2f04 100644
--- a/doc/foot.ini.5.scd
+++ b/doc/foot.ini.5.scd
@@ -619,7 +619,7 @@ can configure the background transparency with the _alpha_ option.
 
 	Default: _7f7f00_.
 
-*flash_alpha*
+*flash-alpha*
 	Flash translucency. A value in the range 0.0-1.0, where 0.0
 	means completely transparent, and 1.0 is opaque.