diff --git a/src/jit/dump.lua b/src/jit/dump.lua
index a11741c6..fe57af8f 100644
--- a/src/jit/dump.lua
+++ b/src/jit/dump.lua
@@ -36,6 +36,7 @@
 --  * m  Dump the generated machine code.
 --    x  Print each taken trace exit.
 --    X  Print each taken trace exit and the contents of all registers.
+--    a  Print the IR of aborted traces, too.
 --
 -- The output format can be set with the following characters:
 --