diff --git a/data/core.yaml b/data/core.yaml
index a6e33c698..ef0c9fe28 100644
--- a/data/core.yaml
+++ b/data/core.yaml
@@ -557,6 +557,7 @@ en:
     edit_reference: "edit/translate"
     wiki_reference: View documentation
     wiki_en_reference: View documentation in English
+    key_value: "key=value"
     multiple_values: Multiple Values
     hidden_preset:
       manual: "{features} are hidden. Enable them in the Map Data pane."
diff --git a/modules/ui/raw_tag_editor.js b/modules/ui/raw_tag_editor.js
index 664fe9038..d7ae0a668 100644
--- a/modules/ui/raw_tag_editor.js
+++ b/modules/ui/raw_tag_editor.js
@@ -139,6 +139,7 @@ export function uiRawTagEditor(context) {
             .append('textarea')
             .attr('class', 'tag-text' + (_tagView !== 'text' ? ' hide' : ''))
             .call(utilNoAuto)
+            .attr('placeholder', t('inspector.key_value'))
             .attr('spellcheck', 'false')
             .merge(textarea);