zsh: improve cutvid help text

.config/zsh/functions/cutvid

@@ -21,7 +21,8 @@ if [[ ${#o_help} -ne 0 || ! -v 2 || ${#o_from} -ne 2 || ${#o_to} -ne 2 ]]; then
           "<INPUT FILE> <OUTPUT FILE> [FFMPEG OPTIONS]"
     print "\e[3mYou can set bitrates with -b:v and -b:a in FFMPEG OPTIONS." \
         "The -vn / -an / -sn / -dn options can be used to skip inclusion of" \
-        "video, audio, subtitle and data streams respectively."
+        "video, audio, subtitle and data streams respectively." \
+        "Use -s WIDTHxHEIGHT to scale."
     print "Visit <https://trac.ffmpeg.org/wiki#Encoding> for tips\e[0m"
     return ${ret}
 fi