-# StringIO\r
-\r
-# Undocumented entities\r
-\r
-::undocumented[]
\ No newline at end of file
+# StringIO
+
+This module contains file I/O related functions that read and
+write contents of textual files into/from String instances.
+
+## Reading
+
+::value[readLines]
+::value[readLinesWithCharset]
+::value[readContentsWithCharset]
+
+## Writing
+
+::value[writeLines]
+::value[appendLine]