diff --git a/app.py b/app.py
index f513e59..8b4d08e 100644
--- a/app.py
+++ b/app.py
@@ -1268,7 +1268,7 @@ def favicon():
 def main_page():
     now = datetime.now(timezone.utc)
 
-    month_param = request.args.get("month", None)  # surowy parametr z URL
+    month_param = request.args.get("m", None)
     start = end = None
 
     if month_param in (None, ""):
diff --git a/templates/main.html b/templates/main.html
index fc09631..c7d3f49 100644
--- a/templates/main.html
+++ b/templates/main.html
@@ -39,7 +39,7 @@
   <label for="monthSelect" class="text-white small mb-0">📅 Wybierz miesiąc:</label>
   <select id="monthSelect" class="form-select form-select-sm bg-dark text-white border-secondary"
           style="min-width: 180px;"
-          onchange="window.location.search='?month='+this.value">
+          onchange="window.location.search='?m='+this.value">
     {% for m in month_options %}
       {% set year, month = m.split('-') %}
       <option value="{{ m }}" {% if selected_month == m %}selected{% endif %}>
@@ -231,12 +231,12 @@
         <div class="d-grid gap-2">
           {% for m in month_options %}
             {% set year, month = m.split('-') %}
-            <a href="{{ url_for('main_page', month=m) }}" 
+            <a href="{{ url_for('main_page', m=m) }}" 
                class="btn btn-outline-light {% if selected_month == m %}active{% endif %}">
               {{ month_names[month|int - 1] }} {{ year }}
             </a>
           {% endfor %}
-          <a href="{{ url_for('main_page', month='all') }}"
+          <a href="{{ url_for('main_page', m='all') }}"
             class="btn btn-outline-secondary {% if selected_month == 'all' %}active{% endif %}">
             📋 Wyświetl wszystkie
           </a>