--- a/centos.rst	Mon Apr 09 23:22:54 2018 +0300
+++ b/centos.rst	Tue Apr 10 13:39:34 2018 +0300
@@ -17,3 +17,21 @@
 https://unix.stackexchange.com/questions/21135/package-bash-completion-missing-from-yum-in-centos-6
   Package bash-completion missing from Yum in CentOS 6.
 
+``epel-release`` is not available in RHEL or Oracle Linux. Obtain package separately::
+
+  $ wget https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
+  $ sudo yum install ./epel-release-latest-7.noarch.rpm
+
+  $ yum install https://dl.fedoraproject.org/pub/epel/epel-release-latest-7.noarch.rpm
+
+You should accept package signing key. List of keys' fingerprints:
+
+https://getfedora.org/keys/
+   This page lists the public GPG keys used for signing packages in Fedora.
+
+Get list of enabled repos::
+
+  $ yum repolist
+
+  $ cat /etc/yum.repo.d/*
+