diff --git a/customisation/back-translation.md b/customisation/back-translation.md
index 8888507c3..ec1d67bb6 100644
--- a/customisation/back-translation.md
+++ b/customisation/back-translation.md
@@ -1,6 +1,18 @@
 ---
 parent: Customisation
-layout: coming_soon
 title: Back-translation
-description:
+description: Back-translating or back-copying target language sentences to augment parallel data
 ---
+
+**Back-translation** is the process of translating the monolingual data in the target language into the source language and then back into the target language.
+The goal is to generate synthetic [parallel data](/customisation/parallel-data.md) that can be used to train machine translation systems.
+
+**Back-copying** is a similar technique to back-translation.
+The process involves using an existing translation to create a new parallel sentence pair in the opposite direction.
+
+### Challenges
+
+Back-translation is challenging for language pairs with significantly different syntactic and semantic features, resulting in low-quality parallel data.
+
+Back-copying generates parallel data that is identical in the source and target languages.
+The lack of diversity can result in a machine translation system that is overly reliant on the [training data](/customisation/training-data.md) and performs poorly on unseen data.