diff --git a/docs/reference/ml/df-analytics/apis/analysisobjects.asciidoc b/docs/reference/ml/df-analytics/apis/analysisobjects.asciidoc
index 035601fe71409..0004416c05cd7 100644
--- a/docs/reference/ml/df-analytics/apis/analysisobjects.asciidoc
+++ b/docs/reference/ml/df-analytics/apis/analysisobjects.asciidoc
@@ -145,7 +145,8 @@ include::{docdir}/ml/ml-shared.asciidoc[tag=lambda]
 include::{docdir}/ml/ml-shared.asciidoc[tag=dependent-variable]
 +
 --
-The data type of the field must be numeric or boolean.
+The data type of the field must be numeric (`integer`, `short`, `long`, `byte`), 
+categorical (`ip`, `keyword`, `text`), or boolean.
 --
   
 `num_top_classes`::