diff --git a/doc/development/documentation/styleguide/_index.md b/doc/development/documentation/styleguide/_index.md
index a623976500f4b5ee446fc2dc9598122b732ba793..d61312f0683b0916dd618e440da024084cf92f00 100644
--- a/doc/development/documentation/styleguide/_index.md
+++ b/doc/development/documentation/styleguide/_index.md
@@ -1160,7 +1160,8 @@ elements:
 
 All UI elements [should be **bold**](#bold). The `>` in the navigation path should not be bold.
 
-Guidance for individual UI elements is in [the word list](word_list.md).
+Guidance for individual UI elements is in [the word list](word_list.md) and in
+[Names for external communication](https://design.gitlab.com/product-foundations/layout/#names-for-external-communication).
 
 ### How to write navigation task steps
 
diff --git a/doc/development/documentation/styleguide/word_list.md b/doc/development/documentation/styleguide/word_list.md
index 38768a0158a5db83909a11d909d51aa0e13aef29..93b0daae536efced2efa045eea89317b088a9f14 100644
--- a/doc/development/documentation/styleguide/word_list.md
+++ b/doc/development/documentation/styleguide/word_list.md
@@ -2061,6 +2061,11 @@ The docs should match the case in the UI, and the page name should be bold. For
 
 - On the **Test cases** page, ...
 
+## panel
+
+To refer to parts of the paneled UI, follow
+[Names for external communication](https://design.gitlab.com/product-foundations/layout/#names-for-external-communication) in Pajamas.
+
 ## parent
 
 Always use as a compound noun.
@@ -2509,6 +2514,11 @@ Do not confuse **set up** with [**configure**](#configure).
 1. Set up your installation.
 1. Configure your installation.
 
+## sidebar
+
+To refer to parts of the paneled UI, follow
+[Names for external communication](https://design.gitlab.com/product-foundations/layout/#names-for-external-communication) in Pajamas.
+
 ## sign in, sign-in
 
 To describe the action of signing in, use: