diff --git a/src/librustdoc/html/layout.rs b/src/librustdoc/html/layout.rs
index cc6b38ebcdb7f..8bef79e2521c2 100644
--- a/src/librustdoc/html/layout.rs
+++ b/src/librustdoc/html/layout.rs
@@ -95,6 +95,7 @@ pub fn render<T: Print, S: Print>(
                            placeholder=\"Click or press ‘S’ to search, ‘?’ for more options…\" \
                            type=\"search\">\
                 </div>\
+                <span class=\"help-button\">?</span>
                 <a id=\"settings-menu\" href=\"{root_path}settings.html\">\
                     <img src=\"{static_root_path}wheel{suffix}.svg\" \
                          width=\"18\" \
diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 082f9cca064f1..24d7d34384f7f 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -473,7 +473,9 @@ function defocusSearchBar() {
     }());
 
     document.addEventListener("click", function(ev) {
-        if (hasClass(ev.target, "collapse-toggle")) {
+        if (hasClass(ev.target, "help-button")) {
+            displayHelp(true, ev);
+        } else if (hasClass(ev.target, "collapse-toggle")) {
             collapseDocs(ev.target, "toggle");
         } else if (hasClass(ev.target.parentNode, "collapse-toggle")) {
             collapseDocs(ev.target.parentNode, "toggle");
diff --git a/src/librustdoc/html/static/rustdoc.css b/src/librustdoc/html/static/rustdoc.css
index d0312d77a7c5d..893e43e7a0329 100644
--- a/src/librustdoc/html/static/rustdoc.css
+++ b/src/librustdoc/html/static/rustdoc.css
@@ -674,7 +674,7 @@ a {
 }
 .search-container > div {
 	display: inline-flex;
-	width: calc(100% - 34px);
+	width: calc(100% - 63px);
 }
 #crate-search {
 	margin-top: 5px;
@@ -1250,14 +1250,24 @@ h4 > .important-traits {
 	outline: none;
 }
 
-#settings-menu {
+#settings-menu, .help-button {
 	position: absolute;
-	right: 0;
 	top: 10px;
+}
+
+#settings-menu {
+	right: 0;
 	outline: none;
 }
 
-#theme-picker, #settings-menu {
+.help-button {
+	right: 30px;
+	font-family: "Fira Sans",sans-serif;
+	text-align: center;
+	font-size: 17px;
+}
+
+#theme-picker, #settings-menu, .help-button {
 	padding: 4px;
 	width: 27px;
 	height: 29px;
diff --git a/src/librustdoc/html/static/themes/ayu.css b/src/librustdoc/html/static/themes/ayu.css
index f4710f6ae873a..94ee8a6f5bdb5 100644
--- a/src/librustdoc/html/static/themes/ayu.css
+++ b/src/librustdoc/html/static/themes/ayu.css
@@ -489,7 +489,7 @@ kbd {
 	box-shadow-color: #c6cbd1;
 }
 
-#theme-picker, #settings-menu {
+#theme-picker, #settings-menu, .help-button {
 	border-color: #5c6773;
 	background-color: #0f1419;
 }
@@ -499,7 +499,8 @@ kbd {
 }
 
 #theme-picker:hover, #theme-picker:focus,
-#settings-menu:hover, #settings-menu:focus {
+#settings-menu:hover, #settings-menu:focus,
+.help-button:hover, .help-button:focus {
 	border-color: #e0e0e0;
 }
 
diff --git a/src/librustdoc/html/static/themes/dark.css b/src/librustdoc/html/static/themes/dark.css
index b3b586ba362fa..c210216194ec7 100644
--- a/src/librustdoc/html/static/themes/dark.css
+++ b/src/librustdoc/html/static/themes/dark.css
@@ -383,13 +383,14 @@ kbd {
 	box-shadow-color: #c6cbd1;
 }
 
-#theme-picker, #settings-menu {
+#theme-picker, #settings-menu, .help-button {
 	border-color: #e0e0e0;
 	background: #f0f0f0;
 }
 
 #theme-picker:hover, #theme-picker:focus,
-#settings-menu:hover, #settings-menu:focus {
+#settings-menu:hover, #settings-menu:focus,
+.help-button:hover, .help-button:focus {
 	border-color: #ffb900;
 }
 
diff --git a/src/librustdoc/html/static/themes/light.css b/src/librustdoc/html/static/themes/light.css
index b0c5715604baa..150460f5c5d2c 100644
--- a/src/librustdoc/html/static/themes/light.css
+++ b/src/librustdoc/html/static/themes/light.css
@@ -377,13 +377,14 @@ kbd {
 	box-shadow-color: #c6cbd1;
 }
 
-#theme-picker, #settings-menu {
+#theme-picker, #settings-menu, .help-button {
 	border-color: #e0e0e0;
 	background-color: #fff;
 }
 
 #theme-picker:hover, #theme-picker:focus,
-#settings-menu:hover, #settings-menu:focus {
+#settings-menu:hover, #settings-menu:focus,
+.help-button:hover, .help-button:focus {
 	border-color: #717171;
 }