diff --git a/subx/011parse.cc b/subx/011run.cc
similarity index 98%
rename from subx/011parse.cc
rename to subx/011run.cc
index 639299df..906a8305 100644
--- a/subx/011parse.cc
+++ b/subx/011run.cc
@@ -1,4 +1,7 @@
-//: Loading programs into the VM. 
+//: Running SubX programs on the VM.
+
+//: (Not to be confused with the 'run' subcommand for running ELF binaries on
+//: the VM. That comes later.)
 
 :(before "End Help Texts")
 put(Help, "syntax",