diff --git a/src/librustdoc/html/static/main.js b/src/librustdoc/html/static/main.js
index 67e50bba1f2e0..e382e5aa2348a 100644
--- a/src/librustdoc/html/static/main.js
+++ b/src/librustdoc/html/static/main.js
@@ -2792,6 +2792,10 @@ function defocusSearchBar() {
         addClass(popup, "hidden");
         popup.id = "help";
 
+        var book_info = document.createElement("span");
+        book_info.innerHTML = "You can find more information in \
+            <a href=\"https://doc.rust-lang.org/rustdoc/\">the rustdoc book</a>.";
+
         var container = document.createElement("div");
         var shortcuts = [
             ["?", "Show this help dialog"],
@@ -2825,6 +2829,7 @@ function defocusSearchBar() {
         addClass(div_infos, "infos");
         div_infos.innerHTML = "<h2>Search Tricks</h2>" + infos;
 
+        container.appendChild(book_info);
         container.appendChild(div_shortcuts);
         container.appendChild(div_infos);
 
diff --git a/src/librustdoc/html/static/rustdoc.css b/src/librustdoc/html/static/rustdoc.css
index 8c8a00d47bc07..d7e9496205ab3 100644
--- a/src/librustdoc/html/static/rustdoc.css
+++ b/src/librustdoc/html/static/rustdoc.css
@@ -796,14 +796,22 @@ body.blur > :not(#help) {
 	clear: left;
 	display: block;
 }
+#help > div > span {
+	text-align: center;
+	display: block;
+	margin: 10px 0;
+	font-size: 18px;
+	border-bottom: 1px solid #ccc;
+	padding-bottom: 4px;
+	margin-bottom: 6px;
+}
 #help dd { margin: 5px 35px; }
 #help .infos { padding-left: 0; }
 #help h1, #help h2 { margin-top: 0; }
 #help > div div {
 	width: 50%;
 	float: left;
-	padding: 20px;
-	padding-left: 17px;
+	padding: 0 20px 20px 17px;;
 }
 
 .stab {
diff --git a/src/librustdoc/html/static/themes/ayu.css b/src/librustdoc/html/static/themes/ayu.css
index 3b15b21889dbd..d1cddf0d65657 100644
--- a/src/librustdoc/html/static/themes/ayu.css
+++ b/src/librustdoc/html/static/themes/ayu.css
@@ -219,7 +219,8 @@ a {
 }
 
 .docblock:not(.type-decl) a:not(.srclink):not(.test-arrow),
-.docblock-short a:not(.srclink):not(.test-arrow), .stability a {
+.docblock-short a:not(.srclink):not(.test-arrow), .stability a,
+#help a {
 	color: #39AFD7;
 }
 
@@ -275,6 +276,10 @@ a {
 	border-radius: 4px;
 }
 
+#help > div > span {
+	border-bottom-color: #5c6773;
+}
+
 .since {
 	color: grey;
 }
diff --git a/src/librustdoc/html/static/themes/dark.css b/src/librustdoc/html/static/themes/dark.css
index f5a8533776843..3545943b3fd97 100644
--- a/src/librustdoc/html/static/themes/dark.css
+++ b/src/librustdoc/html/static/themes/dark.css
@@ -177,7 +177,8 @@ a {
 }
 
 .docblock:not(.type-decl) a:not(.srclink):not(.test-arrow),
-.docblock-short a:not(.srclink):not(.test-arrow), .stability a {
+.docblock-short a:not(.srclink):not(.test-arrow), .stability a,
+#help a {
 	color: #D2991D;
 }
 
@@ -231,6 +232,10 @@ a.test-arrow {
 	border-color: #bfbfbf;
 }
 
+#help > div > span {
+	border-bottom-color: #bfbfbf;
+}
+
 #help dt {
 	border-color: #bfbfbf;
 	background: rgba(0,0,0,0);
diff --git a/src/librustdoc/html/static/themes/light.css b/src/librustdoc/html/static/themes/light.css
index 9dea875b87747..4ce4b63e2c6c3 100644
--- a/src/librustdoc/html/static/themes/light.css
+++ b/src/librustdoc/html/static/themes/light.css
@@ -175,7 +175,8 @@ a {
 }
 
 .docblock:not(.type-decl) a:not(.srclink):not(.test-arrow),
-.docblock-short a:not(.srclink):not(.test-arrow), .stability a {
+.docblock-short a:not(.srclink):not(.test-arrow), .stability a,
+#help a {
 	color: #3873AD;
 }
 
@@ -229,6 +230,10 @@ a.test-arrow {
 	border-color: #bfbfbf;
 }
 
+#help > div > span {
+	border-bottom-color: #bfbfbf;
+}
+
 .since {
 	color: grey;
 }