diff --git a/.gitignore b/.gitignore
index 9af4b102a..bb2279c1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -60,3 +60,6 @@ _docker-storage/
 docs/.static/ruby-doc/
 # ReDoc generated API doc (in the Gitdocs folder)
 docs/.static/api/
+
+# AWS Cloud9 specific folder for user settings
+.c9/
diff --git a/docs/faqs.md b/docs/faqs.md
index ada80d7b2..868855919 100644
--- a/docs/faqs.md
+++ b/docs/faqs.md
@@ -12,3 +12,17 @@ make ruby-doc
 ```
 
 Then open `.static/ruby-doc/index.html` in the `docs` directory and browse the Ruby documentation
+
+## How do I fix the Error `role "ec2-user" does not exist` on an AWS instance?
+
+After installing and configuring PostgreSQL on an AWS EC2 (or AWS Cloud9) instance and running `bin/setup`, this error could occur.
+
+To fix it, run the following two commands in a terminal (assuming your PostgreSQL user is named **postgres**):
+
+```
+sudo -u postgres createuser -s ec2-user
+sudo -u postgres createdb ec2-user
+```
+
+The first command creates the user **ec2-user** and the second one creates the database for this user, because every user needs its database.
+Even if the first command fails, run the second command to create the missing database.