diff --git a/README.md b/README.md
index ce3200d..2e3cb78 100644
--- a/README.md
+++ b/README.md
@@ -17,7 +17,16 @@ A simple, customizable [pomodoro](https://en.wikipedia.org/wiki/Pomodoro_Techniq
 
 ### Commands
 
-- `:TimerStart TIMELIMIT [NAME]` to start a new timer. For example, `:TimerStart 25m Work` to start a timer for 25 minutes called "Work". Currently the time limit can only be specified in hours, minutes, or seconds, such as `10m` for "10 minutes" or `10s` for "10 seconds".
+- `:TimerStart TIMELIMIT [NAME]` to start a new timer.
+
+  The time limit can be specified in hours, minutes, seconds, or a combination of those, and *shouldn't include any spaces*. For example:
+
+  - `:TimerStart 25m Work` to start a timer for 25 minutes called "Work".
+  - `:TimerStart 10s` to start a timer for 10 seconds.
+  - `:TimerStart 1h30m` to start a timer for an hour and a half.
+
+  pomo.nvim will recognize multiple forms of the time units, such as "m", "min", "minute", or "minutes" for minutes.
+
 - `:TimerStop [TIMERID]` to stop a running timer, e.g. `:TimerStop 1`. If no ID is given, the latest timer is stopped.
 
 ## Setup
diff --git a/lua/pomo/commands.lua b/lua/pomo/commands.lua
index b538171..8c15079 100644
--- a/lua/pomo/commands.lua
+++ b/lua/pomo/commands.lua
@@ -7,7 +7,7 @@ local M = {}
 M.register_commands = function()
   vim.api.nvim_create_user_command("TimerStart", function(data)
     if data.fargs == nil or #data.fargs == 0 or #data.fargs > 2 then
-      return log.error "Invalid arguments.\nUsage: TimerStart TIMELIMIT [NAME]"
+      return log.error "Invalid number arguments, expected 2.\nUsage: TimerStart TIMELIMIT [NAME]"
     end
 
     local time_arg = string.lower(data.fargs[1])