diff --git a/tex/header/stdmath.sty b/tex/header/stdmath.sty
index e5b313dd3510f3c20fbd117d09db4c278389ebb8..2cafe51f86bda0dad567db8d64cb2e22c7b80891 100644
--- a/tex/header/stdmath.sty
+++ b/tex/header/stdmath.sty
@@ -10,7 +10,7 @@
 % standard is bibliography.bib
 
 % tikz
-% also loads tikz
+% also loads tikz and pgfplots
 
 % graphicx OR pictures
 % also loads package graphicx (for picture handling)
@@ -51,7 +51,7 @@
 \ProcessOptions\relax
 
 \ifopt@pics\RequirePackage{graphicx}\fi
-\ifopt@tikz\RequirePackage{tikz}\RequirePackage{tikz-cd}\fi
+\ifopt@tikz\RequirePackage{tikz}\RequirePackage{tikz-cd}\RequirePackage{pgfplots}\fi
 \ifopt@script\RequirePackage{mathrsfs}\newcommand{\scr}[1]{\mathscr{#1}}\fi % for script A (sigma-Algebra-A)
 
 % ---------