diff --git a/closure.log b/closure.log
index 3e35217666..3b9f28a74d 100644
--- a/closure.log
+++ b/closure.log
@@ -665,55 +665,27 @@ Found    : PolymerElement
         return super._parseTemplateContent(template, templateInfo, nodeInfo);
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-/polymer.html_script_11.js:815: WARNING - Dangerous use of the global THIS object
-      if (this.stack.length) {
-          ^^^^
-
-/polymer.html_script_11.js:816: WARNING - Dangerous use of the global THIS object
-        let host = this.stack[this.stack.length-1];
-                   ^^^^
-
-/polymer.html_script_11.js:816: WARNING - Dangerous use of the global THIS object
-        let host = this.stack[this.stack.length-1];
-                              ^^^^
-
-/polymer.html_script_11.js:822: WARNING - Dangerous use of the global THIS object
-      this.stack.push(inst);
-      ^^^^
-
-/polymer.html_script_11.js:826: WARNING - Dangerous use of the global THIS object
-      let stackLen = this.stack.length;
-                     ^^^^
-
-/polymer.html_script_11.js:827: WARNING - Dangerous use of the global THIS object
-      if (stackLen && this.stack[stackLen-1] == inst) {
-                      ^^^^
-
-/polymer.html_script_11.js:828: WARNING - Dangerous use of the global THIS object
-        this.stack.pop();
-        ^^^^
-
-/polymer.html_script_11.js:850: WARNING - Type annotation references non-existent type Polymer.Element.
+/polymer.html_script_11.js:862: WARNING - Type annotation references non-existent type Polymer.Element.
      * @type {Array<Polymer.Element>}
                     ^^^^^^^^^^^^^^^
 
-/polymer.html_script_11.js:858: WARNING - Property is never defined on prototype of type HTMLElement
+/polymer.html_script_11.js:870: WARNING - Property is never defined on prototype of type HTMLElement
       console.log('[' + prototype.is + ']: registered')
                         ^^^^^^^^^^^^
 
-/polymer.html_script_11.js:866: WARNING - Dangerous use of the global THIS object
+/polymer.html_script_11.js:878: WARNING - Dangerous use of the global THIS object
       this.registrations.push(prototype);
       ^^^^
 
-/polymer.html_script_11.js:867: WARNING - Dangerous use of the global THIS object
+/polymer.html_script_11.js:879: WARNING - Dangerous use of the global THIS object
       Polymer.log && this._regLog(prototype);
                      ^^^^
 
-/polymer.html_script_11.js:874: WARNING - Dangerous use of the global THIS object
+/polymer.html_script_11.js:886: WARNING - Dangerous use of the global THIS object
       this.registrations.forEach(this._regLog);
       ^^^^
 
-/polymer.html_script_11.js:874: WARNING - Dangerous use of the global THIS object
+/polymer.html_script_11.js:886: WARNING - Dangerous use of the global THIS object
       this.registrations.forEach(this._regLog);
                                  ^^^^
 
@@ -1394,4 +1366,4 @@ externs/closure-types.js:759: WARNING - property toggle on interface Polymer_Arr
 Polymer_ArraySelectorMixin.prototype.toggle;
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
 
-0 error(s), 304 warning(s), 72.7% typed
+0 error(s), 297 warning(s), 72.7% typed
diff --git a/lib/mixins/element-mixin.html b/lib/mixins/element-mixin.html
index 4e9fa3c7bc..62d9505d6a 100644
--- a/lib/mixins/element-mixin.html
+++ b/lib/mixins/element-mixin.html
@@ -829,6 +829,10 @@
 
     stack: [],
 
+    /**
+     * @param {*} inst Instance
+     * @this {hostStack}
+     */
     registerHost(inst) {
       if (this.stack.length) {
         let host = this.stack[this.stack.length-1];
@@ -836,10 +840,18 @@
       }
     },
 
+    /**
+     * @param {*} inst Instance
+     * @this {hostStack}
+     */
     beginHosting(inst) {
       this.stack.push(inst);
     },
 
+    /**
+     * @param {*} inst Instance
+     * @this {hostStack}
+     */
     endHosting(inst) {
       let stackLen = this.stack.length;
       if (stackLen && this.stack[stackLen-1] == inst) {