Add comment to the eslint parent definition issue

Author: Joachim Seminck

lib/util/Components.js

@@ -218,6 +218,7 @@ function componentRule(rule, context) {
       let comment;
       // Sometimes the passed node may not have been parsed yet by eslint, and this function call crashes.
       // Can be removed when eslint sets "parent" property for all nodes on initial AST traversal: https://github.com/eslint/eslint-scope/issues/27
+      // FIXME: Remove try/catch when https://github.com/eslint/eslint-scope/issues/27 is implemented.
       try {
         comment = sourceCode.getJSDocComment(node);
       } catch (e) {