diff --git a/README.md b/README.md
index 1e5a5fe..759647e 100644
--- a/README.md
+++ b/README.md
@@ -192,6 +192,7 @@ Available extended configuration parameters:
 | `force` | Force removes the old target, file or folder, and forces a new link (default:false) |
 | `relative` | Use a relative path when creating the symlink (default:false, absolute links) |
 | `glob` | Treat a `*` character as a wildcard, and perform link operations on all of those matches (default:false) |
+| `if` | Execute this in your `$SHELL` and only link if it is successful. |
 
 #### Example