diff --git a/docs/configuration.md b/docs/configuration.md
index e97d8df96..1dc114816 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -53,6 +53,7 @@ This part of the configuration concerns anything that can affect the whole site.
     - `secondary`: link colour, current [[graph view|graph]] node
     - `tertiary`: hover states and visited [[graph view|graph]] nodes
     - `highlight`: internal link background, highlighted text, [[syntax highlighting|highlighted lines of code]]
+    - `textHighlight`: markdown highlighted text background
 
 ## Plugins