diff --git a/README.md b/README.md
index adc266e0..cab7a27a 100644
--- a/README.md
+++ b/README.md
@@ -115,6 +115,7 @@ A list of [known ITS machines](doc/machines.md).
    - CHARFC/CHARFS, Chaos RFC.
    - CHATST, Chaos test.
    - CHTN, CFTP, Chaosnet TELNET and FTP support.
+   - COMIFY, convert HEX to COM format.
    - COMPLR, lisp compiler.
    - COMSAT, Mail server.
    - CREATE, creates a text file in your home directory from console input.
diff --git a/build/build.tcl b/build/build.tcl
index a16742a5..4c4ca037 100644
--- a/build/build.tcl
+++ b/build/build.tcl
@@ -1026,6 +1026,10 @@ expect ":KILL"
 respond "*" ":midas sys2;ts stylog_sysen1;stylog\r"
 expect ":KILL"
 
+# COMIFY
+respond "*" ":midas sys2;ts comify_sysen3;comify\r"
+expect ":KILL"
+
 # TMPKIL
 respond "*" ":midas sys2;ts tmpkil_syseng;tmpkil\r"
 expect ":KILL"
diff --git a/src/sysen3/comify.41 b/src/sysen3/comify.41
new file mode 100644
index 00000000..51cb7d1d
Binary files /dev/null and b/src/sysen3/comify.41 differ