diff --git a/README.md b/README.md
index 9da7137..f6dedae 100644
--- a/README.md
+++ b/README.md
@@ -183,6 +183,11 @@ Recommended packages :
 * `babel` for a locale-aware number parsing
 
 
+## LIMITATIONS
+
+Don't use nested groups or colout will duplicate the corresponding input text with each matching colors.
+
+
 ## EXAMPLES
 
 * Color in bold red every occurence of the word _color_ in colout sources: