diff --git a/roles/instance-ha/README.md b/roles/instance-ha/README.md
index 09cb516..acba25f 100644
--- a/roles/instance-ha/README.md
+++ b/roles/instance-ha/README.md
@@ -178,8 +178,8 @@ not working:
 3. Check errors: inside the controller's cluster log
    (*/var/log/cluster/corosync.log*) some errors may catch the eye.
 
-Examples on how to ivoke the playbook via ansible
--------------------------------------------------
+Examples on how to invoke the playbook via ansible
+--------------------------------------------------
 
 This command line will install the whole instance-ha solution, with controller
 stonith, compute stonith and all the instance ha steps in:
diff --git a/roles/stonith-config/README.md b/roles/stonith-config/README.md
index a581cd6..621ae93 100644
--- a/roles/stonith-config/README.md
+++ b/roles/stonith-config/README.md
@@ -56,8 +56,8 @@ Limitations
 
 The only kind of STONITH devices supported are **for the moment** IPMI.
 
-Examples on how to ivoke the playbook via ansible
--------------------------------------------------
+Examples on how to invoke the playbook via ansible
+--------------------------------------------------
 
 This command line will install the STONITH devices for the controller nodes:
 
diff --git a/roles/validate-ha/README.md b/roles/validate-ha/README.md
index 3828aca..476f8c0 100644
--- a/roles/validate-ha/README.md
+++ b/roles/validate-ha/README.md
@@ -62,8 +62,8 @@ above.
 
 All tests are performed using the tool [ha-test-suite](https://github.com/redhat-openstack/tripleo-quickstart-utils/tree/master/tools/ha-test-suite).
 
-Examples on how to ivoke the playbook via ansible
--------------------------------------------------
+Examples on how to invoke the playbook via ansible
+--------------------------------------------------
 
 Here's a way to invoke the tests from an *undercloud* machine prepared as
 described [here](https://github.com/redhat-openstack/tripleo-quickstart-utils/tree/master/README.md).