diff --git a/site/src/components/intake/steps/EntityStep.astro b/site/src/components/intake/steps/EntityStep.astro
index a1fa742..c6cf3dd 100644
--- a/site/src/components/intake/steps/EntityStep.astro
+++ b/site/src/components/intake/steps/EntityStep.astro
@@ -73,7 +73,8 @@
   <input type="text" id="pw-frn" class="pw-input" placeholder="10-digit (leave blank if applying via this order)" />
 
   <label class="pw-field">USAC Filer ID (499)</label>
-  <input type="text" id="pw-filer-id" class="pw-input" />
+  <p class="text-xs text-gray-500 -mt-1 mb-1">6-digit number starting with 8 (e.g. 834314). Found on your Form 499-A or at <a href="https://apps.fcc.gov/cgb/form499/499a.cfm" target="_blank" class="text-pw-600 underline">USAC E-File</a>.</p>
+  <input type="text" id="pw-filer-id" class="pw-input" placeholder="e.g. 834314" maxlength="6" pattern="8\d{5}" />
 
   <div class="pw-row">
     <div>