diff --git a/Doc/Makefile b/Doc/Makefile
index 2407b9b..a244f9e 100644
--- a/Doc/Makefile
+++ b/Doc/Makefile
@@ -113,7 +113,7 @@
     libxdrlib.tex libimghdr.tex \
     librestricted.tex librexec.tex libbastion.tex \
     libformatter.tex liboperator.tex libsoundex.tex libresource.tex \
-    libstat.tex
+    libstat.tex libstrio.tex
 
 # Library document
 lib.dvi: $(LIBFILES)
diff --git a/Doc/lib.tex b/Doc/lib.tex
index a7c86d7..66c6b0c 100644
--- a/Doc/lib.tex
+++ b/Doc/lib.tex
@@ -93,6 +93,7 @@
 \input{libregex}
 \input{libregsub}
 \input{libstruct}
+\input{libstrio}
 \input{libsoundex}
 
 \input{libmisc}			% Miscellaneous Services
diff --git a/Doc/lib/lib.tex b/Doc/lib/lib.tex
index a7c86d7..66c6b0c 100644
--- a/Doc/lib/lib.tex
+++ b/Doc/lib/lib.tex
@@ -93,6 +93,7 @@
 \input{libregex}
 \input{libregsub}
 \input{libstruct}
+\input{libstrio}
 \input{libsoundex}
 
 \input{libmisc}			% Miscellaneous Services
diff --git a/Doc/lib/libstrio.tex b/Doc/lib/libstrio.tex
new file mode 100644
index 0000000..fdf973f
--- /dev/null
+++ b/Doc/lib/libstrio.tex
@@ -0,0 +1,14 @@
+\section{Standard Module \sectcode{StringIO}}
+
+\stmodindex{StringIO}
+
+This module implements a file-like class, \code{StringIO},
+that read and write a string buffer (also known as {\em memory
+files}). See the description on file objects for operations.
+
+When a \code{StringIO} object is created, it can be initialized
+to an existing string by passing the string to the constructor.
+If no string is given, the \code{StringIO} will start empty.
+
+The method \code{getvalue()} can be called at any time to return the
+contents of the entire ``file'' at any time.
diff --git a/Doc/libstrio.tex b/Doc/libstrio.tex
new file mode 100644
index 0000000..fdf973f
--- /dev/null
+++ b/Doc/libstrio.tex
@@ -0,0 +1,14 @@
+\section{Standard Module \sectcode{StringIO}}
+
+\stmodindex{StringIO}
+
+This module implements a file-like class, \code{StringIO},
+that read and write a string buffer (also known as {\em memory
+files}). See the description on file objects for operations.
+
+When a \code{StringIO} object is created, it can be initialized
+to an existing string by passing the string to the constructor.
+If no string is given, the \code{StringIO} will start empty.
+
+The method \code{getvalue()} can be called at any time to return the
+contents of the entire ``file'' at any time.