diff --git a/help/CommandLine.html b/help/CommandLine.html
index fee1b3f2..4965a2a1 100644
--- a/help/CommandLine.html
+++ b/help/CommandLine.html
@@ -100,9 +100,9 @@
 		-rgb-card-invert-bit7<br>
 		Force the RGB card (in "Color (RGB Monitor)" video mode) to invert bit7 in MIX mode. Enables the correct rendering for Dragon Wars.<br><br>
 		-50hz<br>
-		Support 50Hz(PAL) video refresh rate and implicitly PAL 1.016MHz.<br><br>
+		Support 50Hz(PAL) video refresh rate and PAL 1.016MHz base CPU clock.<br><br>
 		-60hz<br>
-		Support 60Hz(PAL) video refresh rate and implicitly PAL 1.020MHz (default).<br>
+		Support 60Hz(NTSC) video refresh rate and NTSC 1.020MHz base CPU clock (default).<br>
 
 		<br>
 		<P style="FONT-WEIGHT: bold">Debug arguments: