diff --git a/README.md b/README.md
index 66d5e1e..6488bb1 100644
--- a/README.md
+++ b/README.md
@@ -27,7 +27,7 @@ If you find mistakes, please open an issue or fix them yourself and open a PR.
 - [Analysis II Cheat-Sheet (EN)](./semester3/analysis-ii/cheat-sheet-rb/main.pdf) Author: Robin Bacher
 #### Other Courses
 - [Numerical Methods for Computer Science Summary (DE)](./semester3/numcs/numcs-summary.pdf) Authors: Robin Bacher, Janis Hutz
-- [Systems Programming and Computer Architecture Summary (EN)](./semester3/spca/spca-summary.pdf) Author: Janis Hutz
+- [Systems Programming and Computer Architecture Summary (EN)](./semester3/spca/spca-summary.pdf) Authors: Robin Bacher, Janis Hutz
 
 
 ## Contributing
diff --git a/semester3/numcs/numcs-summary.pdf b/semester3/numcs/numcs-summary.pdf
index 651e641..95a55e5 100644
Binary files a/semester3/numcs/numcs-summary.pdf and b/semester3/numcs/numcs-summary.pdf differ
diff --git a/semester3/numcs/parts/03_zeros/06_newton-nd.tex b/semester3/numcs/parts/03_zeros/06_newton-nd.tex
index 6ab2878..5edb47d 100644
--- a/semester3/numcs/parts/03_zeros/06_newton-nd.tex
+++ b/semester3/numcs/parts/03_zeros/06_newton-nd.tex
@@ -22,7 +22,7 @@ def newton(x, F, DF, tol=1e-12, maxit=50):
     for _ in range(maxit):
         s = np.linal.solve(DF(x), F(x))
         x -= s
-        if np.linalgnorm(s) < tol * np.linalg.norm(x):
+        if np.linalg.norm(s) < tol * np.linalg.norm(x):
             return x
 \end{code}
 
diff --git a/semester3/spca/spca-summary.tex b/semester3/spca/spca-summary.tex
index 4647f72..8dff218 100644
--- a/semester3/spca/spca-summary.tex
+++ b/semester3/spca/spca-summary.tex
@@ -2,6 +2,8 @@
 
 \input{~/projects/latex/dist/full.tex}
 
+\renewcommand{\authorTitle}{Robin Bacher, Janis Hutz\\\url{https://github.com/janishutz/eth-summaries}}
+\renewcommand{\authorHeaders}{Robin Bacher, Janis Hutz}
 \setup{Systems Programming and Computer Architecture}
 
 \usepackage{lmodern}