diff --git a/content/GA_2_5/old_Analysis_GA_solution.ipynb b/content/GA_2_5/old_Analysis_GA_solution.ipynb
index f5d4ccf3fb0dd2dadcb3fcaa55865410b112e018..0466202d1560d813051ada24a152f80658981ea2 100644
--- a/content/GA_2_5/old_Analysis_GA_solution.ipynb
+++ b/content/GA_2_5/old_Analysis_GA_solution.ipynb
@@ -668,11 +668,11 @@
    },
    "outputs": [],
    "source": [
-    "Budget = 40\n",
+    "extension_max_no = 40\n",
     "pop_size = 10\n",
     "\n",
     "# initiate an instance of the problem with max number of selected links as budget constraint\n",
-    "problem = NDP(budget=Budget)\n",
+    "problem = NDP(budget=extension_max_no)\n",
     "\n",
     "# initiate the GA with parameters appropriate for binary variables\n",
     "method = GA(pop_size=pop_size,\n",