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diff --git a/optimization/test_functions/extended_rosenbrock1.m b/optimization/test_functions/extended_rosenbrock1.m
index 1f54520..8d0b4f8 100644
--- a/optimization/test_functions/extended_rosenbrock1.m
+++ b/optimization/test_functions/extended_rosenbrock1.m
@@ -1,17 +1,17 @@
 function f = extended_rosenbrock1(x)
-  ##
-  ## The extended Rosenbrock function. See Dennis & Schnabel, Appendix
-  ## B, problem #1.
-  ##
-  ## This function has a minimum at x=(1,1,...,1) with f(x) == 0. The
-  ## suggested starting point is x0=(-1.2, 1,-1.2, 1,...,-1.2, 1).
-  ## Since the number of arguments is variable, we take a vector
-  ## instead of its individual components.
-  ##
+  %
+  % The extended Rosenbrock function. See Dennis & Schnabel, Appendix
+  % B, problem #1.
+  %
+  % This function has a minimum at x=(1,1,...,1) with f(x) == 0. The
+  % suggested starting point is x0=(-1.2, 1,-1.2, 1,...,-1.2, 1).
+  % Since the number of arguments is variable, we take a vector
+  % instead of its individual components.
+  %
   n = length(x);
 
   if (odd(n))
-    ## 'm' below must be an integer.
+    % 'm' below must be an integer.
     f = NA;
     return;
   end