diff --git a/docs/docs/components/custom.mdx b/docs/docs/components/custom.mdx
index daa121c1c..e2bcab798 100644
--- a/docs/docs/components/custom.mdx
+++ b/docs/docs/components/custom.mdx
@@ -30,7 +30,7 @@ The class can have a [_`build_config`_](focus://8) instance method, which is use
 The [_`build_config`_](focus://8) method should always return a dictionary with specific keys representing the field names and their corresponding configurations.
 It must follow the format described below:
 
-The top level keys are the field names.
+The top-level keys are the field names.
 
 Their values are of type _`dict`_ with any of the following keys (all of them are **optional**):