diff --git a/src/pane-view.coffee b/src/pane-view.coffee
index 03ca52558..4474d2d3b 100644
--- a/src/pane-view.coffee
+++ b/src/pane-view.coffee
@@ -119,7 +119,6 @@ class PaneView extends View
       deprecate 'Please return a Disposable object from your ::onDidChangeTitle method!' unless disposable?.dispose?
       @activeItemDisposables.add(disposable) if disposable?.dispose?
     else if item.on?
-      deprecate 'If you would like your pane item to support title change behavior, please implement a ::onDidChangeTitle() method. ::on methods for items are no longer supported. If not, ignore this message.'
       disposable = item.on('title-changed', @activeItemTitleChanged)
       @activeItemDisposables.add(disposable) if disposable?.dispose?
 
@@ -128,7 +127,6 @@ class PaneView extends View
       deprecate 'Please return a Disposable object from your ::onDidChangeModified method!' unless disposable?.dispose?
       @activeItemDisposables.add(disposable) if disposable?.dispose?
     else if item.on?
-      deprecate 'If you would like your pane item to support modified behavior, please implement a ::onDidChangeModified() method. If not, ignore this message. ::on methods for items are no longer supported.'
       item.on('modified-status-changed', @activeItemModifiedChanged)
       @activeItemDisposables.add(disposable) if disposable?.dispose?
 
diff --git a/src/workspace.coffee b/src/workspace.coffee
index c094aaf92..50c4117fb 100644
--- a/src/workspace.coffee
+++ b/src/workspace.coffee
@@ -486,6 +486,10 @@ class Workspace extends Model
         item = opener(uri, options)
         if item? and typeof item.getUri is 'function' and typeof item.getURI isnt 'function'
           Grim.deprecate("Pane item with class `#{item.constructor.name}` should implement `::getURI` instead of `::getUri`.", {packageName})
+        if item? and typeof item.on is 'function' and typeof item.onDidChangeTitle isnt 'function'
+          Grim.deprecate("If you would like your pane item with class `#{item.constructor.name}` to support title change behavior, please implement a `::onDidChangeTitle()` method. `::on` methods for items are no longer supported. If not, ignore this message.", {packageName})
+        if item? and typeof item.on is 'function' and typeof item.onDidChangeModified isnt 'function'
+          Grim.deprecate("If you would like your pane item with class `#{item.constructor.name}` to support modified behavior, please implement a `::onDidChangeModified()` method. If not, ignore this message. `::on` methods for items are no longer supported.", {packageName})
         item
 
       @openers.push(wrappedOpener)