diff --git a/check_cpu b/check_cpu
index 0f34408ea113bae8a26c233b06adfad5effe9c7e..d82a21933e6684acc5eb51f2a629fbd590924288 100755
--- a/check_cpu
+++ b/check_cpu
@@ -47,7 +47,7 @@ ______________________________________________________________________
 check cpu usage and cpu wait
 Cpu infos are taken from output of top command.
 
-Oh higher cpu usage it can show processes that cause cpu waits and
+On higher cpu usage it can show processes that cause cpu waits and
 with most cpu consumption.
 
 SYNTAX:
diff --git a/check_reboot_required b/check_reboot_required
index 79609f709a1e4a1d0cd43cff51083b96dafd8dfe..327f0ccccd96606d4415ebbd8616f3a19033c851 100755
--- a/check_reboot_required
+++ b/check_reboot_required
@@ -43,7 +43,7 @@ It works for Centos and Debian/ Ubuntu.
 
 If the reboot is required:
 * On Centos it shows the kernel number that will be installed,
-* On Debian7 Ubuntu it shows the packages that require the reboot,
+* On Debian/ Ubuntu it shows the packages that require the reboot,
 
 SYNTAX:
 $(basename $0)
@@ -76,7 +76,7 @@ case $distro in
 
   "centos")
     currentkernel=$(uname -r)
-    out=$(rpm -q --last kernel | head -1 | fgrep $currentkernel)
+    out=$(rpm -q --last kernel | head -1 | grep -F $currentkernel)
     if [ -z "$out" ]; then
       ph.setStatus "warning"
       ph.status "[$distro] need to reboot for kernel $(rpm -q --last kernel | head -1) (current: $currentkernel)"
diff --git a/docs/20_Checks/check_reboot_required.md b/docs/20_Checks/check_reboot_required.md
new file mode 100644
index 0000000000000000000000000000000000000000..0acd157c440ede85929a407c65eb84b652316885
--- /dev/null
+++ b/docs/20_Checks/check_reboot_required.md
@@ -0,0 +1,35 @@
+# Check Reboot required
+
+## Introduction
+
+Check if a reboot is required.
+It works for Centos and Debian/ Ubuntu.
+
+If the reboot is required:
+
+* On Centos it shows the kernel number that will be installed,
+* On Debian/ Ubuntu it shows the packages that require the reboot,
+
+## Syntax
+
+`$ check_reboot_required [-h]`
+
+### Parameters
+
+```text
+OPTIONS:
+
+    -h or --help   show this help.
+
+PARAMETERS:
+
+    None
+```
+
+## Examples
+
+`check_cronstatus`
+    The Check of cronjobs with the default loction does not require any parameter
+
+`check_cronstatus /usr/share/cronwrapper/cronstatus.sh`
+    The Check of cronjobs with custom loction.