diff --git a/TRANSLATIONS.md b/TRANSLATIONS.md
index 478a62d1..6c2a1892 100644
--- a/TRANSLATIONS.md
+++ b/TRANSLATIONS.md
@@ -104,6 +104,11 @@ updated messages are marked "fuzzy". A fuzzy entry will reuse the previous
 translation: you should then go over it and update it as necessary before you
 remove the fuzzy marker.
 
+> **Note:** Your PRs should either be the result of running `msgmerge` or the
+> result of new translation work on the PO file for your language. Avoid mixing
+> the two since it often creates a very large diff, which is hard or impossible
+> to review.
+
 ## Using Translations
 
 This will show you how to use the translations to generate localized HTML