diff --git a/input.html b/input.html
index 6d999ed..b9e6a44 100644
--- a/input.html
+++ b/input.html
@@ -121,6 +121,12 @@
             outline: none;
             box-shadow: 0 0 5px rgba(0, 123, 255, 0.5);
         }
+
+        .optional-label {
+            color: gray;
+            font-style: italic;
+        }
+
     </style>
 </head>
 <body>
@@ -138,7 +144,7 @@
                 <input type="text" id="ac_type" name="ac_type" required>
             </div>
             <div class="form-group">
-                <label for="ac_call">Callsign</label>
+                <label class="optional-label" for="ac_call">Callsign (optional)</label>
                 <input type="text" id="ac_call" name="ac_call">
             </div>
             <div class="form-group">
@@ -167,16 +173,16 @@
             </div>
 
             <div class="form-group">
-                <label for="email">Email</label>
+                <label class="optional-label" for="email">Email (optional)</label>
                 <input type="email" id="email" name="email" >
             </div>
             <div class="form-group">
-                <label for="phone">Phone</label>
+                <label class="optional-label" for="phone">Phone (optional)</label>
                 <input type="text" id="phone" name="phone" >
             </div>
 
             <div class="form-group">
-                <label for="notes">Notes</label>
+                <label class="optional-label" for="notes">Notes (optional)</label>
                 <textarea id="message" name="notes" rows="4" ></textarea>
             </div>
 
