diff --git a/doc/dump_modify.html b/doc/dump_modify.html
index c9112e2e0c..4a1a6b6098 100644
--- a/doc/dump_modify.html
+++ b/doc/dump_modify.html
@@ -589,7 +589,7 @@ box size stored with the snapshot.
 </P>
 <UL><LI>acolor = * red/green/blue/yellow/aqua/cyan
 <LI>adiam = * 1.0
-<LI>amap = min max cf 2 min blue max red
+<LI>amap = min max cf 0.0 2 min blue max red
 <LI>append = no
 <LI>bcolor = * red/green/blue/yellow/aqua/cyan
 <LI>bdiam = * 0.5
diff --git a/doc/dump_modify.txt b/doc/dump_modify.txt
index 0d1593d6d6..f354bc5bea 100644
--- a/doc/dump_modify.txt
+++ b/doc/dump_modify.txt
@@ -582,7 +582,7 @@ The option defaults are
 
 acolor = * red/green/blue/yellow/aqua/cyan
 adiam = * 1.0
-amap = min max cf 2 min blue max red
+amap = min max cf 0.0 2 min blue max red
 append = no
 bcolor = * red/green/blue/yellow/aqua/cyan
 bdiam = * 0.5