diff --git a/data_analysis.py b/data_analysis.py
index 3ef08be..e0f74b0 100644
--- a/data_analysis.py
+++ b/data_analysis.py
@@ -56,8 +56,9 @@ for i, group in enumerate(groupings):
     # Dodanie wartości nad słupkami
     for bar in bars:
         yval = bar.get_height()
-        plt.text(bar.get_x() + bar.get_width()/2.0, yval + max_val * 0.02, f'{yval:.1f}',
-                 ha='center', va='bottom', fontsize=9)
+        label = f'{yval:.1f}'.replace('.', ',')  # <-- tutaj zamiana kropki na przecinek
+        plt.text(bar.get_x() + bar.get_width()/2.0, yval + max_val * 0.02, label,
+                ha='center', va='bottom', fontsize=9)
 
     plt.tight_layout()
     plt.savefig(f"{output_folder}/mean_times_{i}.png")