diff --git a/README.md b/README.md
index 878682d..fbc3a79 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
+# THIS FORK IS CREATED BY ME FOR THE PURPOSE OF AN ERROR CORRECTION PULL REQUEST TO THE ORIGINAL REPO.
+
 # Sudoku-GUI-Solver
 This is a sudoku solver using the backtracking algorithm. It includes a graphical GUI as well as a text based version.
 
diff --git a/solver (text).py b/solver (text).py
index 8032236..03c9716 100644
--- a/solver (text).py	
+++ b/solver (text).py	
@@ -39,7 +39,7 @@ def valid(bo, pos, num):
 
     # Check Col
     for i in range(0, len(bo)):
-        if bo[i][pos[1]] == num and pos[1] != i:
+        if bo[i][pos[1]] == num and pos[0] != i:
             return False
 
     # Check box