diff --git a/lib/legacy/legacy-element-mixin.html b/lib/legacy/legacy-element-mixin.html
index ab6d1e1872..f820a95692 100644
--- a/lib/legacy/legacy-element-mixin.html
+++ b/lib/legacy/legacy-element-mixin.html
@@ -91,6 +91,7 @@
        * passed to `Polymer({...})`) to the static API.
        *
        * @return {!Object} The `import.meta` object set on the prototype
+       * @suppress {missingProperties}
        */
       static get importMeta() {
         return this.prototype.importMeta;
diff --git a/lib/legacy/polymer.dom.html b/lib/legacy/polymer.dom.html
index 5417f12e14..afae35b1c3 100644
--- a/lib/legacy/polymer.dom.html
+++ b/lib/legacy/polymer.dom.html
@@ -398,7 +398,7 @@
    * This method facades to `Polymer.enqueueDebouncer`.
    *
    * @memberof Polymer.dom
-   * @param {Polymer.Debouncer} debouncer Debouncer to enqueue
+   * @param {!Polymer.Debouncer} debouncer Debouncer to enqueue
    */
   Polymer.dom.addDebouncer = Polymer.enqueueDebouncer;
 })();
diff --git a/lib/mixins/element-mixin.html b/lib/mixins/element-mixin.html
index b58b818ded..b0f7fba988 100644
--- a/lib/mixins/element-mixin.html
+++ b/lib/mixins/element-mixin.html
@@ -404,7 +404,7 @@
        * used to create bindings relative to the import path.
        *
        * For elements defined in ES modules, users should implement 
-       * `static get importMeta() { return import.meta; }` and the default
+       * `static get importMeta() { return import.meta; }`, and the default
        * implementation of `importPath` will  return `import.meta.url`'s path.
        * For elements defined in HTML imports, this getter will return the path
        * to the document containing a `dom-module` element matching this
@@ -413,6 +413,7 @@
        * Note, this path should contain a trailing `/`.
        *
        * @return {string} The import path for this element class
+       * @suppress {missingProperties}
        */
       static get importPath() {
         if (!this.hasOwnProperty(JSCompiler_renameProperty('_importPath', this))) {
diff --git a/lib/mixins/property-effects.html b/lib/mixins/property-effects.html
index d5c60613e2..de92b17c4a 100644
--- a/lib/mixins/property-effects.html
+++ b/lib/mixins/property-effects.html
@@ -43,7 +43,7 @@
     READ_ONLY: '__readOnly'
   };
 
-  /** @const {string} */
+  /** @const {RegExp} */
   const capitalAttributeRegex = /[A-Z]/;
 
   /**