DEBUG: add info on $LogPrintVerbose

DEBUG.md

@@ -44,6 +44,20 @@ instead.
 
 Disable or remote that setting to restore regular logging.
 
+## Verbose output
+
+Specific scripts can generate huge amount of output. These do use a function
+`$LogPrintVerbose`, which is declared, but has no code, intentionally.
+
+If you *really* want that output set the function to be the same as
+`$LogPrint`:
+
+    :set LogPrintVerbose $LogPrint;
+
+To revert that change just run:
+
+    :set LogPrintVerbose;
+
 ---
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global-functions.rsc

@@ -850,6 +850,7 @@
 }
 
 # The function $LogPrintVerbose is declared, but has no code, intentionally.
+# https://rsc.eworm.de/DEBUG.md#verbose-output
 
 # get max value
 :set MAX do={