diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 1dc2762..6e069df 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -18,6 +18,8 @@ Suggested software must also be developer-friendly, which means it meets the fol
 
 (iii) If commercial, it has clear pricing.
 
+(iv) It has a documentation in the English language.
+
 ## Pull Requests 
 
 There are two required criteria for a pull request: