diff --git a/docs/reference/esql/processing-commands/where.asciidoc b/docs/reference/esql/processing-commands/where.asciidoc
index 407df30c57215..1d6fc1e90d595 100644
--- a/docs/reference/esql/processing-commands/where.asciidoc
+++ b/docs/reference/esql/processing-commands/where.asciidoc
@@ -5,6 +5,13 @@
 The `WHERE` processing command produces a table that contains all the rows from
 the input table for which the provided condition evaluates to `true`.
 
+[TIP]
+====
+In case of value exclusions, fields with `null` values will be excluded from search results. 
+In this context a `null` means either there is an explicit `null` value in the document or there is no value at all.
+For example: `WHERE field != "value"` will be interpreted as `WHERE field != "value" AND field IS NOT NULL`.
+====
+
 **Syntax**
 
 [source,esql]