diff --git a/Annex/Sim.hs b/Annex/Sim.hs
index ea66cea3e0..f184376074 100644
--- a/Annex/Sim.hs
+++ b/Annex/Sim.hs
@@ -199,6 +199,7 @@ data SimCommand
 	| CommandDisconnect Connections
 	| CommandAddTree RepoName PreferredContentExpression
 	| CommandAdd RawFilePath ByteSize [RepoName]
+	| CommandAddMulti Int String ByteSize ByteSize [RepoName]
 	| CommandStep Int
 	| CommandAction SimAction
 	| CommandSeed Int
@@ -319,6 +320,16 @@ applySimCommand' (CommandAdd file sz repos) st _ =
 			{ simFiles = M.insert file k (simFiles st')
 			}
 		in go k st'' rest
+applySimCommand' (CommandAddMulti n suffix minsz maxsz repos) st repobyname = 
+	let (sz, st') = simRandom st (randomR (minsz, maxsz)) id
+	    file = toRawFilePath (show n ++ suffix)
+	in case applySimCommand' (CommandAdd file sz repos) st' repobyname of
+		Left err -> Left err
+		Right (Right st'') -> 
+			case pred n of
+				0 -> Right (Right st'')
+				n' -> applySimCommand' (CommandAddMulti n' suffix minsz maxsz repos) st'' repobyname
+		Right (Left _) -> error "applySimCommand' CommandAddMulti"
 applySimCommand' (CommandStep _) _ _ = error "applySimCommand' CommandStep"
 applySimCommand' (CommandAction act) st _ =
 	case getSimActionComponents act st of
diff --git a/Annex/Sim/File.hs b/Annex/Sim/File.hs
index d987276710..11c66248c4 100644
--- a/Annex/Sim/File.hs
+++ b/Annex/Sim/File.hs
@@ -49,6 +49,8 @@ generateSimFile = unlines . map unwords . go
 		["addtree", name, expr] : go rest
 	go (CommandAdd f sz repos : rest) =
 		(["add", fromRawFilePath f, showsize sz] ++ map fromRepoName repos) : go rest
+	go (CommandAddMulti n suffix minsz maxsz repos : rest) =
+		(["addmulti", show n, suffix, showsize minsz, showsize maxsz] ++ map fromRepoName repos) : go rest
 	go (CommandStep n : rest) =
 		["step", show n] : go rest
 	go (CommandAction act : rest) = formatAction act : go rest
@@ -127,6 +129,16 @@ parseSimCommand ("add":filename:size:repos) =
 			sz
 			(map RepoName repos)
 		Nothing -> Left $ "Unable to parse file size \"" ++ size ++ "\""
+parseSimCommand ("addmulti":num:suffix:minsize:maxsize:repos) =
+	case readSize dataUnits minsize of
+		Just minsz -> case readSize dataUnits maxsize of
+			Just maxsz -> case readMaybe num of
+				Just n -> Right $ CommandAddMulti 
+					n suffix minsz maxsz
+					(map RepoName repos)
+				Nothing -> Left $ "Unable to parse number \"" ++ num ++ "\""
+			Nothing -> Left $ "Unable to parse file size \"" ++ maxsize ++ "\""
+		Nothing -> Left $ "Unable to parse file size \"" ++ minsize ++ "\""
 parseSimCommand ("step":n:[]) =
 	case readMaybe n of
 			Just n' -> Right $ CommandStep n'
diff --git a/doc/git-annex-sim.mdwn b/doc/git-annex-sim.mdwn
index b87befdf07..eeb3b1cf07 100644
--- a/doc/git-annex-sim.mdwn
+++ b/doc/git-annex-sim.mdwn
@@ -137,6 +137,9 @@ as passed to "git annex sim" while a simulation is running.
   This can be used with the same files more than once, to make multiple
   repositories in the simulation contain the same files.
 
+  Note that adding a large number of files to the simulation can slow it
+  down and make it use a lot of memory.
+
 * `add filename size repo [repo ...]`
 
   Create a simulated annexed file with the specified filename and size,
@@ -156,6 +159,23 @@ as passed to "git annex sim" while a simulation is running.
   different repositories. The files in the simulation are the same across
   all simulated repositories.
 
+* `addmulti N suffix minsize maxsize repo [repo ...]
+
+  Add multiple simulated annexed files, with random sizes in the range
+  between minsize and maxsize.
+
+  The files are named by combining the number, which starts at 1 and goes
+  up to N, with the suffix.
+
+  For example:
+
+    addmulti 100 testfile.jpg 100kb 10mb foo
+
+  That adds files named "1testfile.jpg", 2testfile.jpg", etc.
+
+  Note that adding a large number of files to the simulation can slow it
+  down and make it use a lot of memory.
+
 * `step N`
 
   Run the simulation forward by this many steps.
diff --git a/doc/todo/git-annex_proxies.mdwn b/doc/todo/git-annex_proxies.mdwn
index 1bcaedabaf..56d15a30bc 100644
--- a/doc/todo/git-annex_proxies.mdwn
+++ b/doc/todo/git-annex_proxies.mdwn
@@ -34,9 +34,6 @@ Planned schedule of work:
 
 * sim: Test ActionDropUnwanted Nothing
 
-* sim: Command to create a set of files with random sizes in a specified
-  range.
-
 * sim: implement addtree
 
 * sim: implement ActionDropUnwanted