From c3745279a463b41dd4d3b457bd48f120b371e9ac Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Brigitta=20Sip=C5=91cz?= <bsipocz@gmail.com>
Date: Mon, 16 Jun 2025 21:03:46 -0700
Subject: [PATCH] BUG: notebooks are one-based indexed, so we should not
 zero-index

---
 nbval/plugin.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nbval/plugin.py b/nbval/plugin.py
index ee3ff29..951141c 100644
--- a/nbval/plugin.py
+++ b/nbval/plugin.py
@@ -311,7 +311,7 @@ def collect(self):
         self.nb = nbformat.read(str(self.fspath), as_version=4)
 
         # Start the cell count
-        cell_num = 0
+        cell_num = 1
 
         # Iterate over the cells in the notebook
         for cell in self.nb.cells: