diff --git a/assets/fib.bas b/assets/fib.bas
index 13c792a..17e7b3b 100644
--- a/assets/fib.bas
+++ b/assets/fib.bas
@@ -1 +1,4 @@
 10 DEFUN FIB(N)=IF N==0 THEN 0 ELSE IF N==1 THEN 1 ELSE FIB(N-1)+FIB(N-2)
+20 FOR K=1 TO 12
+30 PRINT FIB(K);" ";
+40 NEXT
diff --git a/assets/tbas/doc/bibliography.tex b/assets/tbas/doc/bibliography.tex
new file mode 100644
index 0000000..43ed1d7
--- /dev/null
+++ b/assets/tbas/doc/bibliography.tex
@@ -0,0 +1,3 @@
+\begin{itemlist}
+\item \emph{PC-BASIC 2.0.3 Documentation} \\ \url{https://robhagemans.github.io/pcbasic/doc/2.0/}
+\end{itemlist}
diff --git a/assets/tbas/doc/facmap.bas b/assets/tbas/doc/facmap.bas
new file mode 100644
index 0000000..854a003
--- /dev/null
+++ b/assets/tbas/doc/facmap.bas
@@ -0,0 +1,3 @@
+10 DEFUN FAC(N)=IF N==0 THEN 1 ELSE N*FAC(N-1)
+20 K=MAP FAC, 1 TO 10
+30 PRINT K
diff --git a/assets/tbas/doc/facrec.bas b/assets/tbas/doc/facrec.bas
new file mode 100644
index 0000000..5ca49fb
--- /dev/null
+++ b/assets/tbas/doc/facrec.bas
@@ -0,0 +1,4 @@
+10 DEFUN FAC(N)=IF N==0 THEN 1 ELSE N*FAC(N-1)
+20 FOR K=1 TO 6
+30 PRINT FAC(K)
+40 NEXT
diff --git a/assets/tbas/doc/fib.bas b/assets/tbas/doc/fib.bas
new file mode 100644
index 0000000..17e7b3b
--- /dev/null
+++ b/assets/tbas/doc/fib.bas
@@ -0,0 +1,4 @@
+10 DEFUN FIB(N)=IF N==0 THEN 0 ELSE IF N==1 THEN 1 ELSE FIB(N-1)+FIB(N-2)
+20 FOR K=1 TO 12
+30 PRINT FIB(K);" ";
+40 NEXT
diff --git a/assets/tbas/doc/functions.tex b/assets/tbas/doc/functions.tex
index f508206..22022c8 100644
--- a/assets/tbas/doc/functions.tex
+++ b/assets/tbas/doc/functions.tex
@@ -71,8 +71,8 @@ Functions are a form of expression that may taks input arguments surrounded by p
         \codeline{Y \textbf{= DIM(}X\textbf{)}}\par
         Returns array with size of \code{X}, all filled with zero.
     \subsection{GETKEYSDOWN}
-        \codeline{Y \textbf{= GETKEYSDOWN(}X\textbf{)}}\par
-        Returns array that contains keycode of keys held down in \code{X}.\par
+        \codeline{\textbf{GETKEYSDOWN} VARIABLE}\par
+        Stores array that contains keycode of keys held down in \code{VARIABLE}.\par
         Actual keycode and the array length depends on the machine: in \thismachine , array length will be fixed to 8. For the list of available keycodes, see \ref{technical}.
     \subsection{INPUT}
         \codeline{\textbf{INPUT} VARIABLE}\par
diff --git a/assets/tbas/doc/langguide.tex b/assets/tbas/doc/langguide.tex
index ff7546c..f30c006 100644
--- a/assets/tbas/doc/langguide.tex
+++ b/assets/tbas/doc/langguide.tex
@@ -1,9 +1,19 @@
 \begin{lstlisting}
-10 REM         TERRAN BASIC
-20 REM     REFERENCE MANUAL
-30 REM      For Version 1.0
-40 REM        First Edition
-100 PRINT "Hello, world!"
-110 PRINT "Git gud!"
-999 END
+10 DEFUN FAC(N)=IF N==0 THEN 1 ELSE N*FAC(N-1)
+20 FOR K=1 TO 6
+30 PRINT FAC(K)
+40 NEXT
+\end{lstlisting}
+
+\begin{lstlisting}
+10 DEFUN FAC(N)=IF N==0 THEN 1 ELSE N*FAC(N-1)
+20 K=MAP FAC, 1 TO 10
+30 PRINT K
+\end{lstlisting}
+
+\begin{lstlisting}
+10 DEFUN FIB(N)=IF N==0 THEN 0 ELSE IF N==1 THEN 1 ELSE FIB(N-1)+FIB(N-2)
+20 FOR K=1 TO 12
+30 PRINT FIB(K);" ";
+40 NEXT
 \end{lstlisting}
diff --git a/assets/tbas/doc/tbasman.tex b/assets/tbas/doc/tbasman.tex
index 61fff7b..81ae831 100644
--- a/assets/tbas/doc/tbasman.tex
+++ b/assets/tbas/doc/tbasman.tex
@@ -179,13 +179,12 @@
 \chapter{Technical Reference}
 \input{implementation}
 
-
-%% Bibliography %%
-% https://robhagemans.github.io/pcbasic/doc/2.0/
-
-
 \chapter{Index}
 
+\chapter{Bibliography}
+\input{bibliography}
+
+
 \chapter*{Disclaimers}
 
 \oreallypress{} is entirely fictional publishing entity; \oreallypress{} has no affiliation whatsoever with any of the real-world publishers.