diff --git a/.readthedocs.yml b/.readthedocs.yml
index 26a861e2..e63ff2ce 100644
--- a/.readthedocs.yml
+++ b/.readthedocs.yml
@@ -1,12 +1,17 @@
 version: 2
 
+build:
+  os: ubuntu-lts-latest
+  tools:
+    python: "mambaforge-22.9"
+
+
 sphinx:
     configuration: docs/conf.py
 
 formats: all
 
 python:
-    version: 3.8
     install:
         - method: pip
           path: .
diff --git a/docs/_file_prefixes.rst b/docs/_file_prefixes.rst
index b19921a0..c8b0af84 100644
--- a/docs/_file_prefixes.rst
+++ b/docs/_file_prefixes.rst
@@ -45,19 +45,15 @@ So what does all those letter mean? Here is a table to explain it.
 
 So, for an original file named ``file.fits``:
 
-  ``o_file.fits``
-
-Means the file have been overscan corrected while
-
-  ``eczsto_file.fits``
+  ``eczst_file.fits``
 
 Means the spectrum has been extracted to a 1D  file but the file has not been
 flat fielded (``f`` missing).
 
 Ideally after running ``redccd`` the file should be named:
 
-  ``cfzsto_file.fits``
+  ``cfzst_file.fits``
 
 And after running ``redspec``:
 
-  ``wecfzsto_file.fits``
+  ``wecfzst_file.fits``