diff --git a/HACKING.tex b/HACKING.tex
index a49113fb93..c868e7ca46 100644
--- a/HACKING.tex
+++ b/HACKING.tex
@@ -207,7 +207,7 @@ Add a new DOWN state to the frob state machine to allow the barinator to
 detect loss of frob.
 
 * frob.h: (struct frob) Add DOWN state flag.
-* frob.c: (frob\_change) set/clear DOWN appropriately on state change.
+* frob.c: (frob_change) set/clear DOWN appropriately on state change.
 * bar.c: (barinate) Check frob for DOWN state.
 \end{verbatim}\end{quote}