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diff --git a/HOWTO b/HOWTO
index f61b4c1d..ac15fc80 100644
--- a/HOWTO
+++ b/HOWTO
@@ -108,8 +108,8 @@ to use any ascii name you want, except 'global' which has special meaning.
 A global section sets defaults for the jobs described in that file. A job
 may override a global section parameter, and a job file may even have
 several global sections if so desired. A job is only affected by a global
-section residing above it. If the first character in a line is a ';', the
-entire line is discarded as a comment.
+section residing above it. If the first character in a line is a ';' or a
+'#', the entire line is discarded as a comment.
 
 So lets look at a really simple job file that define to threads, each
 randomly reading from a 128MiB file.
@@ -343,7 +343,14 @@ prioclass=int	Set the io priority class. See man ionice(1).
 
 thinktime=int	Stall the job x microseconds after an io has completed before
 		issuing the next. May be used to simulate processing being
-		done by an application. See thinktime_blocks.
+		done by an application. See thinktime_blocks and
+		thinktime_spin.
+
+thinktime_spin=int
+		Only valid if thinktime is set - pretend to spend CPU time
+		doing something with the data received, before falling back
+		to sleeping for the rest of the period specified by
+		thinktime.
 
 thinktime_blocks
 		Only valid if thinktime is set - control how many blocks