diff --git a/README.md b/README.md
index f5432dc..892eb32 100644
--- a/README.md
+++ b/README.md
@@ -287,6 +287,9 @@ Event Parameters
     **:MM
     HH:**
     (Mon|mon|Monday|monday) HH:MM
+    (Mon|mon|Monday|monday) HH:**
+    (Mon|mon|Monday|monday) **:MM
+    (Mon|mon|Monday|monday) **:**
 
 #### Examples
 
@@ -320,6 +323,10 @@ You can specify the day of week to run:
 
 ```ruby
 every(1.week, 'myjob', :at => 'Monday 16:20')
+# This runs every Monday at 16:20
+
+every(1.hour, 'myjob', :at => 'Monday **:**')
+# This runs every hour only on Mondays
 ```
 
 If another task is already running at the specified time, clockwork will skip execution of the task with the `:at` option.
diff --git a/lib/clockwork/at.rb b/lib/clockwork/at.rb
index 19ca4f9..39113cc 100644
--- a/lib/clockwork/at.rb
+++ b/lib/clockwork/at.rb
@@ -12,6 +12,12 @@ class FailedToParse < StandardError; end
     def self.parse(at)
       return unless at
       case at
+      when /\A([[:alpha:]]+)\s\*{1,2}:\*{1,2}\z/
+        if wday = WDAYS[$1]
+          new(NOT_SPECIFIED, NOT_SPECIFIED, wday)
+        else
+          raise FailedToParse, at
+        end
       when /\A([[:alpha:]]+)\s(.*)\z/
         if wday = WDAYS[$1]
           parsed_time = parse($2)