diff --git a/lib/node_modules/@stdlib/_tools/remark/plugins/remark-namespace-toc/lib/transformer.js b/lib/node_modules/@stdlib/_tools/remark/plugins/remark-namespace-toc/lib/transformer.js
index 97be45b81c17..f262a951fde9 100644
--- a/lib/node_modules/@stdlib/_tools/remark/plugins/remark-namespace-toc/lib/transformer.js
+++ b/lib/node_modules/@stdlib/_tools/remark/plugins/remark-namespace-toc/lib/transformer.js
@@ -25,6 +25,7 @@ var visit = require( 'unist-util-visit' );
 var createTOC = require( '@stdlib/_tools/markdown/namespace-toc' );
 var startsWith = require( '@stdlib/string/starts-with' );
 var endsWith = require( '@stdlib/string/ends-with' );
+var format = require( '@stdlib/string/format' );
 
 
 // VARIABLES //
@@ -171,7 +172,7 @@ function transformer( tree, file ) {
 					}
 				}
 				if ( i === parent.children.length - 1 ) {
-					throw new Error( 'invalid node. Invalid table of contents (toc) comment. Ensure that the Markdown file includes both starting and ending `toc` comments. Node: `' + node.value + '`.' );
+					throw new Error( format( 'invalid node. Invalid table of contents (toc) comment. Ensure that the Markdown file includes both starting and ending `toc` comments. Node: `%s`.', node.value ) );
 				}
 				if ( found ) {
 					debug( 'Append links to links section...' );