diff --git a/doc/extdev/appapi.rst b/doc/extdev/appapi.rst
index c02e85933..e19e6f03c 100644
--- a/doc/extdev/appapi.rst
+++ b/doc/extdev/appapi.rst
@@ -361,7 +361,7 @@ package.
 
 .. method:: Sphinx.add_env_collector(collector)
 
-   Register a environment collector class (refs: :ref:`collector-api`)
+   Register an environment collector class (refs: :ref:`collector-api`)
 
    .. versionadded:: 1.6
 
diff --git a/doc/intl.rst b/doc/intl.rst
index 97f0e013e..dacced65b 100644
--- a/doc/intl.rst
+++ b/doc/intl.rst
@@ -74,7 +74,7 @@ Quick guide
 ^^^^^^^^^^^
 
 `sphinx-intl`_ is a useful tool to work with Sphinx translation flow.
-This section describe a easy way to translate with sphinx-intl.
+This section describe an easy way to translate with sphinx-intl.
 
 #. Install `sphinx-intl`_ by :command:`pip install sphinx-intl` or
    :command:`easy_install sphinx-intl`.
diff --git a/doc/markup/code.rst b/doc/markup/code.rst
index c7cb0f911..80191c977 100644
--- a/doc/markup/code.rst
+++ b/doc/markup/code.rst
@@ -232,7 +232,7 @@ For example::
 
 
 :rst:dir:`literalinclude` also supports the ``caption`` and ``name`` option.
-``caption`` has a additional feature that if you leave the value empty, the shown
+``caption`` has an additional feature that if you leave the value empty, the shown
 filename will be exactly the one given as an argument.