diff --git a/build_info.json b/build_info.json
index 2ed16c0..c37b9b6 100644
--- a/build_info.json
+++ b/build_info.json
@@ -1,8 +1,8 @@
 {
     "build_time": "",
     "source files": {
-        "version": "v2.2.2-20",
-        "commit": "9b279f65fd45d99ffd45ca6131b07c306e15215e",
+        "version": "v2.2.2-21",
+        "commit": "ea81a055fb6aba360804793c64859b683047140e",
         "dirty": false
     },
     "pytex": {
@@ -154,9 +154,9 @@
         {
             "name": "mkessler-mathfig.sty",
             "source file": "mathfig.pysty",
-            "build time": "2021/10/24 08:55",
-            "source version": "v2.2.2-3",
-            "source commit hash": "1113e0ddd01036e5bad92b18c912e94bbc6f85c4",
+            "build time": "2021/10/27 18:28",
+            "source version": "v2.2.2-21",
+            "source commit hash": "ea81a055fb6aba360804793c64859b683047140e",
             "pytex version": "v1.0.0-18",
             "pytex commit hash": "126d420b7a6ed2d4b2a42d534ab2e12344869643",
             "dirty": false
diff --git a/math/mkessler-mathfig.sty b/math/mkessler-mathfig.sty
index a4728f2..5e140c4 100644
--- a/math/mkessler-mathfig.sty
+++ b/math/mkessler-mathfig.sty
@@ -27,7 +27,7 @@
 % 
 % Build details:
 %   PyTeX version: v1.0.0-18 (commit 126d420)
-%   Source code version: v2.2.2-3 (commit 1113e0d)
+%   Source code version: v2.2.2-21 (commit ea81a05)
 % 
 % This LaTeX package is free software and distributed under the MIT License. You
 % may use it freely for your purposes. The latest version of the package can be
@@ -39,7 +39,7 @@
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
 \NeedsTeXFormat{LaTeX2e}
-\ProvidesPackage{mkessler-mathfig}[2021/10/24 - Math figures with TikZ / pgfplots / xy]
+\ProvidesPackage{mkessler-mathfig}[2021/10/27 - Math figures with TikZ / pgfplots / xy]
 
 
 % This is just a collection of the packages I use to typeset mathematical figures
@@ -54,6 +54,7 @@
 \usetikzlibrary{calc, intersections, through, quotes, angles, babel, positioning, snakes}
 
 \RequirePackage{tikz-cd} %Commutative diagrams
+\RequirePackage{xparse}
 
 
 %%for small diagrams, similar to tikz-cd
@@ -63,3 +64,24 @@
 % \xyoption{all}
 % here, but this messes with the catcode of the @ sign (which no package should do!)
 % so that further parts in this package would get broken
+
+
+\newcommand\pushoutsymbol{\tikz[baseline=0.5,scale=0.2]{
+        \draw[-] (0,0) --(0,1) -- (1,1);
+    \draw (1,0) circle (1.5pt);}
+}
+
+\newcommand\pullbacksymbol{\tikz[baseline=0.5,scale=0.2]{
+        \draw[-] (0,0) --(1,0) -- (1,1);
+    \draw (0,1) circle (1.5pt);}
+}
+
+% This is used in a tikzcd
+\NewDocumentCommand\pushout{ O{dr} }{
+    \arrow[phantom, pos=0.45]{#1}{\pushoutsymbol}
+}
+
+% This is used in a tikzcd
+\NewDocumentCommand\pullback{ O{dr} }{
+    \arrow[phantom, pos=0.45]{#1}{\pullbacksymbol}
+}