diff --git a/doc/Guidebook.mn b/doc/Guidebook.mn
index 80f5aedae..89499b9bf 100644
--- a/doc/Guidebook.mn
+++ b/doc/Guidebook.mn
@@ -1711,6 +1711,8 @@ Autocompletes.
 Debug mode only.
 .lp "#wizkill "
 Remove monsters from play by just pointing at them.
+By default the hero gets credit or blame for killing the targets.
+Precede this command with the \(oq\f(CRm\fP\(cq prefix to override that.
 Autocompletes.
 Debug mode only.
 .lp #wizlevelport
diff --git a/doc/Guidebook.tex b/doc/Guidebook.tex
index 51e808236..e1c0dc1b0 100644
--- a/doc/Guidebook.tex
+++ b/doc/Guidebook.tex
@@ -1839,6 +1839,8 @@ Debug mode only.
 %.lp
 \item[\tb{\#wizkill}]
 Remove monsters from play by just pointing at them.
+By default the hero gets credit or blame for killing the targets.
+Precede this command with the `{\tt m}' prefix to override that.
 Autocompletes.
 Debug mode only.
 %.lp