diff --git a/configuration.md b/configuration.md
index 058b29d1e..d4393b868 100644
--- a/configuration.md
+++ b/configuration.md
@@ -1147,6 +1147,9 @@ A detailed description of each function is available in the [reference documenta
 **cfg.flank.ztransform** - [ft_spikedetection](/reference/contrib/spike/ft_spikedetection)  
 
 
+**cfg.flip** - [ft_volumerealign](/reference/ft_volumerealign)  
+
+
 **cfg.flipdim** - [ft_sliceinterp](/reference/ft_sliceinterp)