diff --git a/Configuration.md b/Configuration.md
index c51420d..696c09c 100644
--- a/Configuration.md
+++ b/Configuration.md
@@ -89,6 +89,14 @@ default: `0`
 [Extrahighlighted warnings](https://github.com/morhetz/gruvbox/pull/34#issue-40671836)  
 default: `0`
 
+### g:gruvbox_guisp_fallback
+Delegates `guisp` colorings to `guifg` or `guibg`. This is handy for terminal vim. Uses `guifg` or `guibg` for colors originally assigned to `guisp`. `guisp` concerns the colors of underlines and strikethroughs. Terminal vim cannot color underlines and strikethroughs, only gVim can. This option instructs vim to color `guifg` or `guibg` as a fallback.
+
+default: `'NONE'`
+
+Possible Values: `'fg'`, `'bg'`
+
+
 Functions
 ---------