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-rw-r--r--src/emu/debug/debughlp.cpp3
1 files changed, 2 insertions, 1 deletions
diff --git a/src/emu/debug/debughlp.cpp b/src/emu/debug/debughlp.cpp
index dd2a506cde8..a62704c5472 100644
--- a/src/emu/debug/debughlp.cpp
+++ b/src/emu/debug/debughlp.cpp
@@ -978,7 +978,8 @@ const help_item f_static_help_list[] =
"debugger until a breakpoint or watchpoint is hit, or until you manually break in using the "
"assigned key. Before executing, the gni command sets a temporary unconditional breakpoint "
"<count> instructions sequentially past the current one, which is automatically removed when "
- "hit. If <count> is omitted, its default value is 1."
+ "hit. If <count> is omitted, its default value is 1. If <count> is specified as zero, the "
+ "command does nothing. <count> is not permitted to exceed 512 decimal."
"\n"
"Examples:\n"
"\n"