diff --git a/API.md b/API.md
index f1d8feb..2a6e66b 100644
--- a/API.md
+++ b/API.md
@@ -60,7 +60,7 @@ Adds a tree to the tree table.
 #### Parameters
 * `name`: The tree’s name.
 * `author`: The author’s / owners’ name
-* `treedef`: The full tree definition, see lua_api.txt
+* `treedef`: The full tree definition, see `lua_api.txt`
 
 #### Return value
 The tree ID of the new tree.