diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a8fb1f8e9..0bbd6c8ea 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -9,11 +9,11 @@ If you want to implement something big: Please start a discussion about that in
 
 ## Python
 
-Use python 3.6 for development. Paperless supports python 3.6, 3.7 and 3.8.
+Paperless supports python 3.6, 3.7, 3.8 and 3.9.
 
 ## Branches
 
-master always reflects the latest release.
+master always reflects the latest release. Apart from changes to the documentation or readme, absolutely no functional changes on this branch in between releases.
 
 dev contains all changes that will be part of the next release. Use this branch to start making your changes.
 
diff --git a/docs/configuration.rst b/docs/configuration.rst
index 56537035c..e26180382 100644
--- a/docs/configuration.rst
+++ b/docs/configuration.rst
@@ -278,7 +278,7 @@ PAPERLESS_OCR_DESKEW=<bool>
 PAPERLESS_OCR_ROTATE_PAGES=<bool>
     Tells paperless to correct page rotation (90°, 180° and 270° rotation).
 
-    If you notice that paperless is not rotating pages incorrectly rotated
+    If you notice that paperless is not rotating incorrectly rotated
     pages (or vice versa), try adjusting the threshold up or down (see below).
 
     Defaults to ``true``, which enables this feature.
@@ -287,7 +287,7 @@ PAPERLESS_OCR_ROTATE_PAGES=<bool>
 PAPERLESS_OCR_ROTATE_PAGES_THRESHOLD=<num>
     Adjust the threshold for automatic page rotation by ``PAPERLESS_OCR_ROTATE_PAGES``.
     This is an arbitrary value reported by tesseract. "15" is a very conservative value,
-    whereas "2" is a very aggressive option and will often result correctly rotated pages
+    whereas "2" is a very aggressive option and will often result in correctly rotated pages
     being rotated as well.
 
     Defaults to "12".
@@ -338,7 +338,7 @@ PAPERLESS_OCR_USER_ARGS=<json>
     the API of OCRmyPDF, you have to specify these in a format that can be
     passed to the API. See `the API reference of OCRmyPDF <https://ocrmypdf.readthedocs.io/en/latest/api.html#reference>`_
     for valid parameters. All command line options are supported, but they
-    use underscores instead of dashed.
+    use underscores instead of dashes.
 
     .. caution::