diff --git a/src/Mod/Fem/codeformating.md b/src/Mod/Fem/codeformating.md
index b5cd6ba15b..8cb4b4a549 100644
--- a/src/Mod/Fem/codeformating.md
+++ b/src/Mod/Fem/codeformating.md
@@ -1,4 +1,5 @@
 # FEM coding rules
+- These coding rules apply to FEM module code only. Other modules or the base system may use different coding rules especially in naming policy of Python.
 
 ## Python and C++
 - All files should have a licence header
@@ -13,7 +14,7 @@
 - maximal line length is 100
 - double quotes as string identifier
 - One import per line, no * imports allowed as it makes harder to validate code
-- the import of FreeCADGui should be guarded by a "if FreeCAD.GuiUp:"
+- the import of FreeCADGui should be guarded by a 'if FreeCAD.GuiUp:'
 
 ### Naming policy
 - snake_case_names
@@ -24,7 +25,10 @@
 ### Python code formating tools
 - flake8
     - in source code directory on Linux shell
+ '''
  find src/Mod/Fem/ -name "*\.py" | grep -v InitGui.py | xargs -I [] flake8 --ignore=E266,W503 --max-line-length=100 []
+ '''
+ 
 - www.lgtm.com
 - TODO: check pylint
 - automatic code formater will not be used for existant code
@@ -33,3 +37,10 @@
 ## C++
 ### Naming policy
 - CamelCase names
+
+## Spelling
+- Take care on spelling. Quit often it is ignored to check for missspelling.
+- codespelling could be used
+'''
+codespell -q 3 -L aci,aline,alledges,als,ang,beginn,behaviour,bloaded,calculater,cancelled,cancelling,cas,cascade,centimetre,childs,colour,colours,currenty,doubleclick,dum,eiter,elemente,feld,freez,iff,indicies,initialisation,initialise,initialised,initialises,initialisiert,kilometre,lod,mantatory,methode,metres,millimetre,modell,nd,noe,normale,normaly,nto,numer,oder,ot,pres,programm,que,recurrance,rougly,seperator,serie,sinc,strack,substraction,te,thist,thru,tread,vertexes,uint,unter,whitespaces -S *.ts,*.po src/Mod/Fem
+'''