diff --git a/appendix/basic_commands.tex b/appendix/basic_commands.tex
index e848c21..386b693 100644
--- a/appendix/basic_commands.tex
+++ b/appendix/basic_commands.tex
@@ -3172,7 +3172,15 @@ \subsection{INT}
 
 \subsection{LEFT\$}
 
-<TODO>
+The {\ttfamily LEFT\$} function takes a string and number and returns a
+substring containing the specified number of leftmost characters.\\
+
+Example:\\
+
+\codeblock {
+	PRINT LEFT\$("BASEBALL", 4)\\
+	BASE\\
+}
 
 \subsection{LEN}
 
@@ -3204,7 +3212,15 @@ \subsection{POS}
 
 \subsection{RIGHT\$}
 
-<TODO>
+The {\ttfamily RIGHT\$} function takes a string and number and returns a
+substring containing the specified number of rightmost characters.\\
+
+Example:\\
+
+\codeblock {
+	PRINT RIGHT\$("BASEBALL", 4)\\
+	BALL\\
+}
 
 \subsection{RND}