diff --git a/BUGS.md b/BUGS.md
index 2ea2841..e75af68 100644
--- a/BUGS.md
+++ b/BUGS.md
@@ -1,6 +1,8 @@
 
 # BUGS
 
+- no test3 está contar 1.0 valores numa pergunta do tipo info? acontece para type: info, e não para type: information
+- mostrar solucao na revisao de prova nas perguntas radio e checkbox.
 - impedir os eventos copy/paste. alunos usam isso para trazer codigo ja feito nos computadores. Obrigar a fazer reset? fazer um copy automaticamente?
 - se aluno entrar com l12345 rebenta. numa funcao get_... ver imagem no ipad
 - a revisao do teste não mostra as imagens.
diff --git a/MANUAL.md b/MANUAL.md
index 5ead728..af09b67 100644
--- a/MANUAL.md
+++ b/MANUAL.md
@@ -109,7 +109,23 @@ To review the tests:
 The grades are stored in the sqlite3 file specified in the test.
 We can get the results into a csv file and later import it into LibreOffice:
 
-```.bash
+```bash
     $ sqlite3 demo/students.db "select student_id,grade from tests where ref='my-test-reference'" > grades.csv
 ```
 
+## Error in a question
+
+Found error in a question after the test. What to do?
+
+A possibility is to remove, for each student, the points of that question from the final grade, and then rescale the all the grades.
+This means removing that question and assigning those points to the other questions keeping the proportions.
+
+The following query gets the final grades and the corrected points of the faulty question, so that a compensation can be done.
+
+```bash
+sqlite3 students.db "select tests.student_id,tests.grade,questions.grade from tests inner join questions on tests.student_id=questions.student_id where tests.ref='ti-test3' and questions.ref='differential-entropy'"
+```
+
+This example is for the test `ti-test3` and faulty question `differential-entropy`.
+
+
diff --git a/README.md b/README.md
index 1c67331..1cd438d 100644
--- a/README.md
+++ b/README.md
@@ -16,7 +16,6 @@ The webserver is a python application and requires `python3.7` and `pip` to be i
 - Pygments
 - SQLAlchemy
 - bcrypt
-- markdown
 
 These can be installed for a single user (recommended), in a python virtual environment or system wide.
 
diff --git a/static/codemirror b/static/codemirror
index 6eafd2c..afa3052 120000
--- a/static/codemirror
+++ b/static/codemirror
@@ -1 +1 @@
-libs/codemirror-5.42.0/
\ No newline at end of file
+libs/codemirror-5.42.2/
\ No newline at end of file
--
libgit2 0.21.2