diff --git a/app.py b/app.py
index c3160be..54afc13 100644
--- a/app.py
+++ b/app.py
@@ -186,14 +186,16 @@ def predict():
 
 @app.route('/add_letter', methods=['POST'])
 def add_letter():
-
     global word
-    global current_letter
 
-    if current_letter:
-        word += current_letter
+    data = request.get_json()
 
-    return "OK"
+    letter = data.get("letter", "")
+
+    if letter:
+        word += letter
+
+    return jsonify(success=True)
 
 
 @app.route('/undo_letter', methods=['POST'])
diff --git a/templates/index.html b/templates/index.html
index cf81b53..f0943d5 100644
--- a/templates/index.html
+++ b/templates/index.html
@@ -403,10 +403,24 @@
 
         function addLetter(){
 
-            fetch('/add_letter',{
-                method:'POST'
-            }).then(updateWord);
-        }
+    const displayedLetter =
+        currentLetter.textContent
+            .split(' ')[0];
+
+    fetch('/add_letter',{
+
+        method:'POST',
+
+        headers:{
+            'Content-Type':'application/json'
+        },
+
+        body:JSON.stringify({
+            letter: displayedLetter
+        })
+
+    }).then(updateWord);
+}
 
 
         function undoLetter(){