diff --git a/doc/source/install/prepare.rst b/doc/source/install/prepare.rst
index 03ecc1ab..ffc35a02 100644
--- a/doc/source/install/prepare.rst
+++ b/doc/source/install/prepare.rst
@@ -23,7 +23,7 @@ compare the results with baseline data provided.
 
 System prerequisites
 =====================
-**Supported Operation Systems**
+**Supported Operating Systems**
 
 * Ubuntu Server 12.04 LTS
 * RHEL/CentOS 6.4
diff --git a/doc/source/install/ssl.rst b/doc/source/install/ssl.rst
index 43cd779f..6578e58b 100644
--- a/doc/source/install/ssl.rst
+++ b/doc/source/install/ssl.rst
@@ -16,7 +16,7 @@
 =================
 SSL configuration
 =================
-Murano components are able to work with SSL. This chapter will help your
+Murano components are able to work with SSL. This chapter will help you
 to make proper settings with SSL configuration.
 
 HTTPS for Murano API
diff --git a/doc/source/specification/murano-env-temp.rst b/doc/source/specification/murano-env-temp.rst
index d359dea5..8d455d09 100644
--- a/doc/source/specification/murano-env-temp.rst
+++ b/doc/source/specification/murano-env-temp.rst
@@ -189,7 +189,7 @@ environment template.
 +----------------+-----------------------------------------------------------+
 | 401            | User is not authorized to access this session             |
 +----------------+-----------------------------------------------------------+
-| 404            | The environment template does not exit                    |
+| 404            | The environment template does not exist                   |
 +----------------+-----------------------------------------------------------+
 
 Delete environment template
@@ -217,7 +217,7 @@ Delete environment template
 +----------------+-----------------------------------------------------------+
 | 401            | User is not authorized to access this session             |
 +----------------+-----------------------------------------------------------+
-| 404            | The environment template does not exit                    |
+| 404            | The environment template does not exist                   |
 +----------------+-----------------------------------------------------------+
 
 Adding application to environment template
@@ -298,7 +298,7 @@ Adding application to environment template
 +----------------+-----------------------------------------------------------+
 | 401            | User is not authorized to access this session             |
 +----------------+-----------------------------------------------------------+
-| 404            | The environment template does not exit                    |
+| 404            | The environment template does not exist                   |
 +----------------+-----------------------------------------------------------+
 
 Get applications information from an environment template
@@ -366,7 +366,7 @@ Get applications information from an environment template
 +----------------+-----------------------------------------------------------+
 | 401            | User is not authorized to access this session             |
 +----------------+-----------------------------------------------------------+
-| 404            | The environment template does not exit                    |
+| 404            | The environment template does not exist                   |
 +----------------+-----------------------------------------------------------+
 
 Create an environment from an environment template
@@ -422,7 +422,7 @@ Create an environment from an environment template
 +----------------+-----------------------------------------------------------+
 | 401            | User is not authorized to access this session             |
 +----------------+-----------------------------------------------------------+
-| 404            | The environment template does not exit                    |
+| 404            | The environment template does not exist                   |
 +----------------+-----------------------------------------------------------+
 | 409            | The environment already exists                            |
-+----------------+-----------------------------------------------------------+
\ No newline at end of file
++----------------+-----------------------------------------------------------+