Altium Designer Documentation


Created: December 14, 2020 | Updated: July 22, 2021

Parent page: PCB Commands

The following pre-packaged resources, derived from this base command, are available:

Applied Parameters: None


This command is used to add a new comment thread to a selected component in the active document. Comments are a feature associated with Managed Projects and allow all working on a document to comment and review the design (or part thereof) in real-time without actual modification of the document itself.

The commenting feature facilitates strong review and collaboration processes. Due to the server nature of comments (they are stored on the server and do not touch the design document in any way) they become invaluable when:

  • You want to point out some issues in the document without physically merging and getting conflicts.
  • You want to add a comment which will become visible to everybody instantly prior to committing your working copy.
  • You want to have a list of notes for your current design that is attached to areas of the document and could be closed as the design matures (similar to a to-do list).


Before you can start using the comment feature, ensure that you have opened (checked out) a Managed Project and are working on its PCB document. This is done using the File » Open Managed Project command. Only those projects currently shared with you will be available for selection.

This command can be accessed from the PCB editor when a component is selected in the design space by:

  • Choosing the Place » Comment command from the main menus.
  • Using the Alt+Ctrl+C keyboard shortcut.
  • Right-clicking in the design space then choosing Comment command from the context menu.
The command will only be available provided a single component is currently selected in the design space.

This command can also be accessed from the schematic and schematic library editors by:

  • Clicking  from the top right corner of the design space.
  • Clicking  from the Comments panel.


After launching the command, the cursor changes to a crosshair with a blue dot at the center. Position the crosshair where you want the comment located, then click. Type your comment then click the Post button. The comment will be committed and appear in the Comments panel and also in the design space. You can double-click the comment to open the Comments panel.

After launching the command, the Comments panel will open ready to enter a new comment. Type your comment then click Post. The comment will be committed and will appear in the panel and also in the design space and linked to the component by a reference line. A rectangular bounding line is drawn around the component, encompassing its footprint (including pads) and designator.


  1. When a comment is added, it is seen instantly by all other users that have that same Managed Project and document open in their respective Workspaces.
  2. The Comments panel will track the entire thread of a specific comment, whereas only the latest comment in that thread is displayed in the workspace.
  3. The active/selected comment on the Comments panel is highlighted. In the workspace, that active/selected comment is distinguished through the visibility of its reference line.
  4. You can move a comment around in the workspace only in terms of the area in which the text is displayed. The reference line extends from the bounding line around the component to the text area.
  5. The display and appearance of comments on the PCB are controlled from the Document Comments region on the Data Management - Servers page of the Preferences dialog. To turn off the display of comments in the workspace - relying on just the Comments panel - disable the Show Comment Threads option. Other controls in the region relate to the look and feel of the comment and its reference line.


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