diff --git a/man/extra/extra.3lua.scd b/man/extra/extra.3lua.scd
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+++ b/man/extra/extra.3lua.scd
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+EXTRA(3lua) "3lua" "Callisto manual pages"
+
+# NAME
+*extra* - extra utility library
+
+# SYNOPSIS
+.Syn
+
+# DESCRIPTION
+The *extra* library provides utility routines
+not pertaining to any other library.
+
+Using the *csto* interpreter, these routines will be loaded into
+the global environment, rather than its own library table;
+therefore, these manuals will refer to *extra*'s routines
+by their individual names (without the library prefix).
+
+# SEE ALSO
+callisto(3lua)
diff --git a/man/extra/printfmt.3lua.scd b/man/extra/printfmt.3lua.scd
new file mode 100644
index 0000000..b15ff2c
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+++ b/man/extra/printfmt.3lua.scd
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+PRINTFMT(3lua) "3lua" "Callisto manual pages"
+
+# NAME
+*printfmt* - write formatted data to standard output
+
+# SYNOPSIS
+*printfmt*(_fstring_: *string*, _..._)
+
+# DESCRIPTION
+*printfmt* writes formatted data
+specified by the format string _fstring_ to standard output,
+behaving similarly to the built in Lua function *string.format*.
+
+It is somewhat equivalent to:
+
+	io.stdout:write(string.format(_fstring_, _..._), '\n')
+
+# EXAMPLES
+Output the values of a list in CSV format:
+
+```
+list = {2, 4, 8, 16}
+printfmt("%d,%d,%d,%d", list[1], list[2], list[3], list[4])
+```
+
+Without using *printfmt* or other string formatting functions,
+this example would require extensive concatenation.
+
+# SEE ALSO
+callisto(3lua), extra(3lua)
diff --git a/man/extra/sleep.3lua.scd b/man/extra/sleep.3lua.scd
new file mode 100644
index 0000000..f7a0f3c
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+++ b/man/extra/sleep.3lua.scd
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+SLEEP(3lua) "3lua" "Callisto manual pages"
+
+# NAME
+*sleep* - suspend execution
+
+# SYNOPSIS
+*sleep*(_n_: *number*)
+
+# DESCRIPTION
+*sleep* suspends execution of the current script until
+_n_ seconds have passed.
+
+# EXAMPLES
+Sleep for 5 minutes:
+
+	sleep(5 \* 60)
+
+# SEE ALSO
+callisto(3lua), extra(3lua)