diff --git a/bin/sys/ts.gas b/bin/sys/ts.gas
new file mode 100644
index 00000000..29ec14bf
Binary files /dev/null and b/bin/sys/ts.gas differ
diff --git a/doc/programs.md b/doc/programs.md
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--- a/doc/programs.md
+++ b/doc/programs.md
@@ -111,6 +111,7 @@
 - FRETTY, display list of free TTYs.
 - FTPS, FTP server.
 - FTPU, FTP client.
+- GAS, particle simulation.
 - GCMAIL, delete old files from .MAIL.
 - GENSYM, generate unique values.
 - GEORGE, Locks DRAGON HOARD to hold PFTHMG at bay.