diff --git a/docs/configuration.rst b/docs/configuration.rst
index 62880208f..bd3fe1a4f 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -258,6 +258,8 @@ PAPERLESS_OCR_LANGUAGE=<lang>
 
     Defaults to "eng".
 
+		Note: If your language contains a '-' such as chi-sim, you must use chi_sim
+
 PAPERLESS_OCR_MODE=<mode>
     Tell paperless when and how to perform ocr on your documents. Four modes
     are available: