diff --git a/Concepts.md b/Concepts.md
index 2dadece..ef6626e 100644
--- a/Concepts.md
+++ b/Concepts.md
@@ -237,7 +237,7 @@ All binary questions are confirmed by <kbd>y</kbd> or <kbd>Y</kbd>.
 
 The following special variables can be accessed from the command prompt or a spawned shell:
 
-| Variable | Description |
+| Variable | Substitution |
 |:---:| --- |
 | `$nnn` | Hovered file _name_ in current context |
 | `$dN` | Path open in context N [N=1/2/3/4] |