diff --git a/docu/mars-manual.lyx b/docu/mars-manual.lyx
index b6e31d26..44816050 100644
--- a/docu/mars-manual.lyx
+++ b/docu/mars-manual.lyx
@@ -16047,11 +16047,25 @@ The macros containing the substring
 \family typewriter
 -threshold-
 \family default
- use this as a default value for approximation whether something has been
- reached.
+ or 
+\family typewriter
+-almost-
+\family default
+ are using this as a default value for approximation whether something has
+ been approximately reached.
  Default is 10MiB.
 \end_layout
 
+\begin_layout Plain Layout
+
+\size scriptsize
+The $size argument may be a number optionally followed by one the lowercase
+ characters k m g t p for indicating kilo mega giga tera or peta bytes as
+ multiples of 1000.
+ When using the corresponding uppercase character, multiples of 1024 are
+ formed instead.
+\end_layout
+
 \end_inset
 
 
@@ -17546,7 +17560,8 @@ $res
 \family typewriter
 $size
 \family default
- argument is given, it must be a number, optionally followed by suffix 
+ argument is given, it must be a number, optionally followed by a lowercase
+ suffix 
 \family typewriter
 k
 \family default
@@ -17558,15 +17573,44 @@ m
 \family typewriter
 g
 \family default
-, or 
+, 
 \family typewriter
 t
 \family default
- (denoting size factors in powers of two).
+, or 
+\family typewriter
+p
+\family default
+ (denoting size factors as multiples of 1000), or an uppercase suffix 
+\family typewriter
+K
+\family default
+, 
+\family typewriter
+M
+\family default
+, 
+\family typewriter
+G
+\family default
+, 
+\family typewriter
+T
+\family default
+ or 
+\family typewriter
+P
+\family default
+ (denoting size factors as multiples of 1024).
  The given size must not exceed the actual size of 
 \family typewriter
 $disk_dev
 \family default
+.
+ It will specify the future resource size as shown by 
+\family typewriter
+marsadm view-resource-size $res
+\family default
 .
 \end_layout
 
@@ -17771,7 +17815,6 @@ $mars_name
 $res
 \family default
 .
- 
 \end_layout
 
 \begin_layout Plain Layout
diff --git a/userspace/marsadm b/userspace/marsadm
index 5dc19c91..72ed8a87 100755
--- a/userspace/marsadm
+++ b/userspace/marsadm
@@ -4890,7 +4890,7 @@ foreach my $arg (@ARGV) {
     $window = $arg;
     next;
   } elsif ($arg =~ s/--threshold\s*=\s*([0-9]+)/$1/) {
-    $threshold = $arg;
+    $threshold = get_size($arg);
     next;
   } elsif ($arg =~ s/--host\s*=\s*([-_A-Za-z0-9]+)/$1/) {
     check_id($arg);