diff --git a/spec/atom/command-interpreter-spec.coffee b/spec/atom/command-interpreter-spec.coffee
index 9c30546e8..0b39d430b 100644
--- a/spec/atom/command-interpreter-spec.coffee
+++ b/spec/atom/command-interpreter-spec.coffee
@@ -10,6 +10,11 @@ describe "CommandInterpreter", ->
     editor = new Editor({buffer})
     interpreter = new CommandInterpreter()
 
+  describe "addresses", ->
+    it "selects the given lines", ->
+      interpreter.eval(editor, '4,7')
+      expect(editor.selection.getBufferRange()).toEqual [[3, 0], [6, 0]]
+
   describe "substitution", ->
     it "does nothing if there are no matches", ->
       editor.selection.setBufferRange([[6, 0], [6, 44]])
diff --git a/src/atom/commands.pegjs b/src/atom/commands.pegjs
index 2c85a647f..74f52b110 100644
--- a/src/atom/commands.pegjs
+++ b/src/atom/commands.pegjs
@@ -4,10 +4,10 @@
 }
 
 start
-  = address:address? _ command:substitution {
+  = address:address? _ command:substitution? {
     var operations = [];
     if (address) operations.push(address);
-    operations.push(command);
+    if (command) operations.push(command);
     return operations;
   }