diff --git a/modules/document/tpl/extra_keys.html b/modules/document/tpl/extra_keys.html
index 37f1e66c4..69f76d76f 100644
--- a/modules/document/tpl/extra_keys.html
+++ b/modules/document/tpl/extra_keys.html
@@ -22,14 +22,14 @@
 			<div class="x_control-group">
 				<label class="x_control-label" for="eid">{$lang->eid}</label>
 				<div class="x_controls">
-					<input type="text" name="eid" id="eid" value="{$selected_var->eid}" />
+					<input type="text" name="eid" id="eid" value="{$selected_var->eid}" placeholder="Ex) extra_vars_1" />
 					<p class="x_help-inline">{$lang->about_extra_vars_eid_value}</p>
 				</div>
 			</div>
 			<div class="x_control-group">
 				<label class="x_control-label" for="lang_name">{$lang->column_name}</label>
 				<div class="x_controls">
-					<input type="text" name="name" id="name" value="{htmlspecialchars($selected_var->name)}" class="lang_code" />
+					<input type="text" name="name" id="name" value="{htmlspecialchars($selected_var->name)}" class="lang_code" placeholder="Ex) Your favorite color." />
 				</div>
 			</div>
 			<div class="x_control-group">
@@ -50,14 +50,14 @@
 			<div class="x_control-group">
 				<label class="x_control-label" for="default">{$lang->default_value}</label>
 				<div class="x_controls">
-					<input type="text" name="default" id="default" value="{$selected_var->default}" />
+					<input type="text" name="default" id="default" value="{$selected_var->default}" placeholder="Ex) Red, Green, Blue" />
 					<p class="x_help-inline">{$lang->about_extra_vars_default_value}</p>
 				</div>
 			</div>
 			<div class="x_control-group">
 				<label class="x_control-label" for="lang_desc">{$lang->description}</label>
 				<div class="x_controls">
-					<input type="text" name="desc" id="desc" value="{htmlspecialchars($selected_var->desc)}" class="lang_code" />
+					<input type="text" name="desc" id="desc" value="{htmlspecialchars($selected_var->desc)}" class="lang_code" placeholder="Ex) Displayed as your choice." />
 				</div>
 			</div>
 			<div class="x_control-group">