diff --git a/main.tex b/main.tex
index c49b24a..a5fe200 100644
--- a/main.tex
+++ b/main.tex
@@ -24,7 +24,7 @@
 
 \section{File I/O}
 
-\begin{tabularx}{\textwidth}{lr>{\ttfamily}cX}
+\begin{tabularx}{\textwidth}{p{4em}p{2em}>{\ttfamily}cX}
   \toprule
   read & 0 & rdi & File descriptor to read from \\
   & & rsi & Address of buffer \\
@@ -44,7 +44,7 @@
 
 \section{Process Control}
 
-\begin{tabularx}{\textwidth}{lr>{\ttfamily}cX}
+\begin{tabularx}{\textwidth}{p{4em}p{2em}>{\ttfamily}cX}
   \toprule
   fork & 57 & \textrm{\textendash} & No parameters \\
   \midrule