diff --git a/etc/bashrc b/etc/bashrc
index e2046ac3ac..c10f68cede 100644
--- a/etc/bashrc
+++ b/etc/bashrc
@@ -66,7 +66,9 @@ foamCompiler=system
 export WM_COMPILER=Gcc
 unset WM_COMPILER_ARCH WM_COMPILER_LIB_ARCH
 
-#- Architecture:
+#- Memory addressing:
+#    On a 64bit OS this can be 32bit or 64bit
+#    On a 32bit OS addressing is 32bin and this option is not used
 #    WM_ARCH_OPTION = 32 | 64
 export WM_ARCH_OPTION=64
 
diff --git a/etc/config/settings.csh b/etc/config/settings.csh
index 43ee59792c..f94ca376e3 100644
--- a/etc/config/settings.csh
+++ b/etc/config/settings.csh
@@ -85,17 +85,6 @@ case Linux:
         setenv WM_COMPILER I64
         breaksw
 
-    case mips64:
-        setenv WM_ARCH SiCortex64
-        setenv WM_MPLIB MPI
-        setenv WM_COMPILER_LIB_ARCH 64
-        setenv WM_CC 'gcc'
-        setenv WM_CXX 'g++'
-        setenv WM_CFLAGS '-mabi=64 -fPIC'
-        setenv WM_CXXFLAGS '-mabi=64 -fPIC'
-        setenv WM_LDFLAGS '-mabi=64 -G0'
-        breaksw
-
     case ppc64:
         setenv WM_ARCH linuxPPC64
         setenv WM_COMPILER_LIB_ARCH 64
diff --git a/etc/config/settings.sh b/etc/config/settings.sh
index 1402e74a00..b03ca27277 100644
--- a/etc/config/settings.sh
+++ b/etc/config/settings.sh
@@ -104,17 +104,6 @@ Linux)
         export WM_COMPILER=I64
         ;;
 
-    mips64)
-        WM_ARCH=SiCortex64
-        WM_MPLIB=MPI
-        export WM_COMPILER_LIB_ARCH=64
-        export WM_CC='gcc'
-        export WM_CXX='g++'
-        export WM_CFLAGS='-mabi=64 -fPIC'
-        export WM_CXXFLAGS='-mabi=64 -fPIC'
-        export WM_LDFLAGS='-mabi=64 -G0'
-        ;;
-
     armv7l)
         WM_ARCH=linuxARM7
         export WM_COMPILER_LIB_ARCH=32
diff --git a/etc/cshrc b/etc/cshrc
index a9976b5999..a2baf7f281 100644
--- a/etc/cshrc
+++ b/etc/cshrc
@@ -66,7 +66,9 @@ setenv WM_COMPILER Gcc
 setenv WM_COMPILER_ARCH # defined but empty
 unsetenv WM_COMPILER_LIB_ARCH
 
-#- Architecture:
+#- Memory addressing:
+#    On a 64bit OS this can be 32bit or 64bit
+#    On a 32bit OS addressing is 32bin and this option is not used
 #    WM_ARCH_OPTION = 32 | 64
 setenv WM_ARCH_OPTION 64