diff --git a/.gitignore b/.gitignore
index ad7a584..ef25be1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,4 +2,5 @@ __pycache__/
 .DS_Store
 demo/ans
 demo/students.db
-LIXO
\ No newline at end of file
+LIXO
+static/libs
diff --git a/README.md b/README.md
index 1cd438d..e60b10f 100644
--- a/README.md
+++ b/README.md
@@ -17,39 +17,44 @@ The webserver is a python application and requires `python3.7` and `pip` to be i
 - SQLAlchemy
 - bcrypt
 
-These can be installed for a single user (recommended), in a python virtual environment or system wide.
+These can be installed for a single user, in a python virtual environment or system wide.
 
-#### Installing packages for a single user (recommended)
+#### Installing packages for a single user
 
 ```.bash
-pip3 install --user tornado mistune pyyaml pygments sqlalchemy bcrypt markdown
+pip3 install --user tornado mistune pyyaml pygments sqlalchemy bcrypt
 ```
 
 #### Installing packages in a virtual environment (alternative)
 
 ```bash
-pyvenv-3.6 venv/perguntations              # or other virtualenv directory
-source venv/perguntations/bin/activate     # activate virtualenv
+python3 -m venv PATH/TO/VENV/perguntations
+source PATH/TO/VENV/perguntations/bin/activate     # activate virtualenv
 
 pip3 install tornado mistune pyyaml pygments sqlalchemy bcrypt markdown
 ```
 
 #### Installing packages system wide (alternative)
 
-I personally prefer python packages to be installed for a single user, but if a system wide installation is required, it is probably better to use the operating system package manager instead of `pip`:
+I personally prefer python packages to be installed for a single user, but if a system wide installation is required, the operating system package manager should be used:
 
 Linux: 
 
 ```bash
-apt-get install py37-tornado py37-mistune? py37-yaml py37-pygments...
+apt install python3-tornado python3-mistune python3-yaml python3-pygments...
 ```
 
 macOS macports: 
 
 ```bash
-port install py37-py37-tornado py37-mistune? py37-yaml py37-pygments...
+port install py37-tornado py37-mistune py37-yaml py37-pygments...
 ```
 
+FreeBSD:
+
+```bash
+pkg install py37-tornado py37-mistune py37-yaml py37-pygments...
+```
 
 ### 1.2 Install and setup perguntations
 
@@ -65,6 +70,22 @@ where USERNAME is your account on bitbucket.
 The server will run an https server and requires valid certificates.
 To generate certificates, there are two possibilities: public server with static IP address or a private server.
 
+The thirdparty javascript libraries are not included in the repository. They should be downloaded and installed in the directory perguntations/static/lib.
+
+The following libraries are currently necessary (as of 24/1/2019):
+
+```
+DataTables
+MDB-Free_4
+MathJax-2.7.5
+bootstrap-4.2.1-dist
+codemirror-5.42.2
+fontawesome-free-5.6.3-web
+jquery-3.3.1.min.js
+popper.min.js
+```
+
+
 #### Generating certificates for a public server (FreeBSD)
 
 ```sh
@@ -153,6 +174,7 @@ Ports 80 and 443 are reserved for the root user and and this software _should NO
 
 ```.bash
 iptables -t nat -I PREROUTING -i eth0 -p tcp --dport 80 -j REDIRECT --to-ports 8080
+FIXME: also for port 443...
 ```
 
 Explanation:
@@ -176,7 +198,9 @@ Edit `/etc/pf.conf`:
 
 or `ext_if="vtnet0"` for guest additions under virtual box.
 
-Edit `rc.conf`
+Start firewall with `sudo service pf start`.
+
+Optionally, to activate pf on boot, edit `rc.conf`:
 
     pf_enable="YES"
     pf_flags=""
@@ -187,11 +211,10 @@ Edit `rc.conf`
     pflog_flags=""
     pflog_logfile="/var/log/pflog"
 
-Reboot.
 
 ## Troubleshooting
 
-* The server tries to run `python3.6` so this command must be accessible from user accounts. 
+* The server tries to run `python3` so this command must be accessible from user accounts. Currently, the minimum supported python version is 3.6.
 * If you are getting any `UnicodeEncodeError` type of errors that's because the terminal is not supporting UTF-8. This error may occur when a unicode character is printed to the screen by the server or, when running question generator or correction scripts, a message is piped between the server and the scripts that includes unicode characters.
 Try running `locale` on the terminal and see if there are any error messages. Solutions:
     - debian: fix it with `sudo dpkg-reconfigure locales`, select your UTF-8 locales and try again.
@@ -212,4 +235,4 @@ Try running `locale` on the terminal and see if there are any error messages. So
 
 ### Contacts ###
 
-* Miguel Barão mjsb@uevora.pt
\ No newline at end of file
+* Miguel Barão mjsb@uevora.pt
diff --git a/models.py b/models.py
index d3f1a9c..8d2081b 100644
--- a/models.py
+++ b/models.py
@@ -21,7 +21,10 @@ class Student(Base):
     questions = relationship('Question', back_populates='student')
 
     def __repr__(self):
-        return 'Student:\n  id: "{0}"\n  name: "{1}"\n  password: "{2}"'.format(self.id, self.name, self.password)
+        return f'Student:\n\
+        id: "{self.id}"\n\
+        name: "{self.name}"\n\
+        password: "{self.password}"'
 
 
 # ---------------------------------------------------------------------------
@@ -43,17 +46,17 @@ class Test(Base):
     questions = relationship('Question', back_populates='test')
 
     def __repr__(self):
-        return 'Test:\n\
-        id: "{}"\n\
-        ref="{}"\n\
-        title="{}"\n\
-        grade="{}"\n\
-        state="{}"\n\
-        comment="{}"\n\
-        starttime="{}"\n\
-        finishtime="{}"\n\
-        filename="{}"\n\
-        student_id="{}"\n'.format(self.id, self.ref, self.title, self.grade, self.state, self.comment, self.starttime, self.finishtime, self.filename, self.student_id)
+        return f'Test:\n\
+        id: "{self.id}"\n\
+        ref: "{self.ref}"\n\
+        title: "{self.title}"\n\
+        grade: "{self.grade}"\n\
+        state: "{self.state}"\n\
+        comment: "{self.comment}"\n\
+        starttime: "{self.starttime}"\n\
+        finishtime: "{self.finishtime}"\n\
+        filename: "{self.filename}"\n\
+        student_id: "{self.student_id}"\n'
 
 
 # ---------------------------------------------------------------------------
@@ -72,14 +75,14 @@ class Question(Base):
     test = relationship('Test', back_populates='questions')
 
     def __repr__(self):
-        return 'Question:\n\
-            id: "{}"\n\
-            ref: "{}"\n\
-            grade: "{}"\n\
-            starttime: "{}"\n\
-            finishtime: "{}"\n\
-            student_id: "{}"\n\
-            test_id: "{}"\n'.fotmat(self.id, self.ref, self.grade, self.starttime, self.finishtime, self.student_id, self.test_id)
+        return f'Question:\n\
+        id: "{self.id}"\n\
+        ref: "{self.ref}"\n\
+        grade: "{self.grade}"\n\
+        starttime: "{self.starttime}"\n\
+        finishtime: "{self.finishtime}"\n\
+        student_id: "{self.student_id}"\n\
+        test_id: "{self.test_id}"\n'
 
 
 # ---------------------------------------------------------------------------
diff --git a/serve.py b/serve.py
index a4fd0c5..628a023 100755
--- a/serve.py
+++ b/serve.py
@@ -168,6 +168,7 @@ class FileHandler(BaseHandler):
                     self.write(data)
                     await self.flush()
 
+                break  # for loop
 
 # -------------------------------------------------------------------------
 # Test shown to students
--
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