diff --git a/README.md b/README.md
index 01cb168..5a4fe2f 100644
--- a/README.md
+++ b/README.md
@@ -641,7 +641,7 @@ Notes to understand the conversion and to fix issues from the literal data:
 Take care of nested structures: items must not belong to themselves, else they
 will be managed as canvases.
 
-Of course, if the literal structure is well formed, you don't have to consider
+Of course, if the literal structure is well-formed, you don't have to consider
 these fixes.
 
 Otherwise, in IIIF v3, multiple structures are appended when there are multiple