diff --git a/website/usage/_install/_troubleshooting.jade b/website/usage/_install/_troubleshooting.jade
index c846ff957..2135f323a 100644
--- a/website/usage/_install/_troubleshooting.jade
+++ b/website/usage/_install/_troubleshooting.jade
@@ -38,9 +38,10 @@ p
     |  #[code spacy/data] directory. This means your user needs permission to do
     |  this. The above error mostly occurs when doing a system-wide installation,
     |  which will create the symlinks in a system directory. Run the
-    |  #[code download] or #[code link] command as administrator, or use a
-    |  #[code virtualenv] to install spaCy in a user directory, instead
-    |  of doing a system-wide installation.
+    |  #[code download] or #[code link] command as administrator (on Windows,
+    |  simply right-click on your terminal or shell ans select "Run as
+    |  Administrator"), or use a #[code virtualenv] to install spaCy in a user
+    |  directory, instead of doing a system-wide installation.
 
 +h(3, "no-cache-dir") No such option: --no-cache-dir
 
diff --git a/website/usage/_linguistic-features/_rule-based-matching.jade b/website/usage/_linguistic-features/_rule-based-matching.jade
index 7872b668f..39062493a 100644
--- a/website/usage/_linguistic-features/_rule-based-matching.jade
+++ b/website/usage/_linguistic-features/_rule-based-matching.jade
@@ -91,6 +91,10 @@ p
         +cell.u-nowrap #[code LOWER]
         +cell The lowercase form of the token text.
 
+    +row
+        +cell #[code LENGTH]
+        +cell The length of the token text.
+
     +row
         +cell.u-nowrap #[code IS_ALPHA], #[code IS_ASCII], #[code IS_DIGIT]
         +cell
@@ -335,7 +339,8 @@ p
     |  flag.
 
 +code.
-    IS_DEFINITELY = nlp.vocab.add_flag(re.compile(r'deff?in[ia]tely').match)
+    definitely_flag = lambda text: bool(re.compile(r'deff?in[ia]tely').match(text))
+    IS_DEFINITELY = nlp.vocab.add_flag(definitely_flag)
 
     matcher = Matcher(nlp.vocab)
     matcher.add('DEFINITELY', None, [{IS_DEFINITELY: True}])
diff --git a/website/usage/_models/_install-basics.jade b/website/usage/_models/_install-basics.jade
index 7b32e3333..3fb8fa00c 100644
--- a/website/usage/_models/_install-basics.jade
+++ b/website/usage/_models/_install-basics.jade
@@ -31,3 +31,13 @@ p
     import spacy
     nlp = spacy.load('en')
     doc = nlp(u'This is a sentence.')
+
++infobox("Important note", "⚠️")
+    |  To allow loading models via convenient shortcuts like #[code 'en'], spaCy
+    |  will create a symlink within the #[code spacy/data] directory. This means
+    |  that your user needs the #[strong required permissions].
+    |  If you've installed spaCy to a system directory and don't have admin
+    |  privileges, the model linking may fail. The easiest solution
+    |  is to re-run the command as admin, or use a #[code virtualenv]. For more
+    |  info on this, see the
+    |  #[+a("/usage/#symlink-privilege") troubleshooting guide].
diff --git a/website/usage/_models/_install.jade b/website/usage/_models/_install.jade
index 769d3f2d6..7473e41a6 100644
--- a/website/usage/_models/_install.jade
+++ b/website/usage/_models/_install.jade
@@ -132,7 +132,7 @@ p
     # set up shortcut link to load local model as "my_amazing_model"
     python -m spacy link /Users/you/model my_amazing_model
 
-+infobox("Important note")
++infobox("Important note", "⚠️")
     |  In order to create a symlink, your user needs the #[strong required permissions].
     |  If you've installed spaCy to a system directory and don't have admin
     |  privileges, the #[code spacy link] command may fail. The easiest solution