diff --git a/qutebrowser/qutebrowser.conf b/qutebrowser/qutebrowser.conf
index f0cc3e4..7d1b07e 100644
--- a/qutebrowser/qutebrowser.conf
+++ b/qutebrowser/qutebrowser.conf
@@ -100,6 +100,8 @@
 # print-element-backgrounds (Bool):
 #     Whether the background color and images are also drawn when the
 #     page is printed.
+#     This setting only works with Qt 5.8 or newer when using the
+#     QtWebEngine backend.
 #     Valid values: true, false
 #     Default: true
 #
@@ -113,7 +115,7 @@
 #     Default: false
 #
 # site-specific-quirks (Bool):
-#     Enable workarounds for broken sites.
+#     Enable QtWebKit workarounds for broken sites.
 #     Valid values: true, false
 #     Default: true
 #
@@ -369,6 +371,8 @@ prompt-filebrowser = true
 #     The proxy to use.
 #     In addition to the listed values, you can use a `socks://...` or
 #     `http://...` URL.
+#     This setting only works with Qt 5.8 or newer when using the
+#     QtWebEngine backend.
 #         system: Use the system wide proxy.
 #         none: Don't use any proxy
 #     Default: system
@@ -770,8 +774,8 @@ indicator-padding = 2,2,0,4
 #     Default: true
 #
 # cache-size (Int):
-#     Size of the HTTP network cache.
-#     Default: 52428800
+#     Size of the HTTP network cache. Empty to use the default value.
+#     Default:
 download-directory = ~/downloads
 prompt-download-directory = true
 remember-download-directory = true
@@ -805,10 +809,9 @@ cache-size = 52428800
 #     Default: false
 #
 # webgl (Bool):
-#     Enables or disables WebGL. For QtWebEngine, Qt/PyQt >= 5.7 is
-#     required for this setting.
+#     Enables or disables WebGL.
 #     Valid values: true, false
-#     Default: false
+#     Default: true
 #
 # css-regions (Bool):
 #     Enable or disable support for CSS regions.
@@ -848,6 +851,8 @@ cache-size = 52428800
 #
 # javascript-can-access-clipboard (Bool):
 #     Whether JavaScript programs can read or write to the clipboard.
+#     With QtWebEngine, writing the clipboard as response to a user
+#     interaction is always allowed.
 #     Valid values: true, false
 #     Default: false
 #
@@ -883,7 +888,8 @@ cache-size = 52428800
 #     Default: no-3rdparty
 #
 # cookies-store (Bool):
-#     Whether to store cookies.
+#     Whether to store cookies. Note this option needs a restart with
+#     QtWebEngine.
 #     Valid values: true, false
 #     Default: true
 #
@@ -948,7 +954,9 @@ enable-pdfjs = false
 #
 # mode (String):
 #     Mode to use for hints.
-#         number: Use numeric hints.
+#         number: Use numeric hints. (In this mode you can also type
+#     letters form the hinted element to filter and reduce the number of
+#     elements that are hinted.)
 #         letter: Use the chars in the hints -> chars setting.
 #         word: Use hints words based on the html elements and the extra
 #     words.