diff --git a/mixdom.ado b/mixdom.ado
index 713133e..e4043b9 100644
--- a/mixdom.ado
+++ b/mixdom.ado
@@ -1,11 +1,21 @@
-*! mixdom version 1.1 3/11/2015 Joseph N. Luchman
+*! mixdom version 2.0 2/15/2021 Joseph N. Luchman
 
-version 12.1
+version 12
 
 program define mixdom, eclass
 
 syntax varlist(min = 2 fv ts) [pw fw] if, id(varlist max = 1 min = 1) [REopt(string) XTMopt(string) ///
-noConstant]
+Mopt(string) noConstant]
+
+if strlen("`xtmopt'") & strlen("`mopt'") {
+    display as err "{cmd:xtmopt} both {cmd:mopt} cannot be used together"
+	exit 198
+}
+
+if c(stata_version) >= 13 local reg "mixed"
+else local reg "xtmixed"
+
+if strlen("`xtmopt'") local mopt "`xtmopt'"
 
 tempname estmat r2w r2b base_e base_u mean_h
 
@@ -19,7 +29,7 @@ foreach temp in base_e base_u mean_h {
 
 }
 
-xtmixed `dv' `ivs' [`weight'`exp'] `if' , `constant' || `id':, `reopt' `xtmopt' nostderr
+`reg' `dv' `ivs' [`weight'`exp'] `if' , `constant' || `id':, `reopt' `mopt' nostderr
 
 matrix `estmat' = e(b)
 
@@ -49,7 +59,7 @@ di `r2b'
 
 if missing(`base_e') | missing(`base_u') {
 
-	xtmixed `dv' [`weight'`exp'] `if' , `constant' || `id':, `reopt' `xtmopt' nostderr
+	`reg' `dv' [`weight'`exp'] `if' , `constant' || `id':, `reopt' `mopt' nostderr
 
 	matrix `estmat' = e(b)
 
@@ -82,14 +92,13 @@ end
 /* programming notes and history
 
 - mixdom version 1.0 - date - Jan 15, 2014
-
 Basic version
-
 -----
-
 - mixdom version 1.1 - date - Mar 11, 2015
-
-//notable changes\\
 - added version statement (12.1)
 - time series operators allowed
 - removed scalars persisting after estimation
+-----
+- mixdom version 2.0.1 - date - Feb 15, 2021
+- -xtmopt()- depreciated in favor of -mopt()-
+-- v12...
diff --git a/mixdom.sthlp b/mixdom.sthlp
index 42eeb46..bdbcc2c 100644
--- a/mixdom.sthlp
+++ b/mixdom.sthlp
@@ -1,5 +1,5 @@
 {smcl}
-{* *! version 1.1 March 11 2015 J. N. Luchman}{...}
+{* *! version 2.0.0 Feb 15, 2021 J. N. Luchman}{...}
 {cmd:help mixdom}
 {hline}{...}
 
@@ -12,7 +12,7 @@ Wrapper program for {cmd:domin} to conduct linear mixed effects regression domin
 
 {phang}
 {cmd:mixdom} {it:depvar} {it:indepvars} {it:{help if}} {weight} {cmd:,} 
-{opt id(idvar)} [{opt {ul on}re{ul off}opt(re_options)} {opt {ul on}xtm{ul off}opt(xtmixed_options)} {opt {ul on}noc{ul off}onstant}]
+{opt id(idvar)} [{opt {ul on}re{ul off}opt(re_options)} {opt {ul on}m{ul off}opt(mixed_options)} {opt {ul on}noc{ul off}onstant}]
 
 {phang}{cmd:pweight}s and {cmd:fweight}s are allowed (see help {help weights:weights}).  {help fvvarlist:Factor} and 
 {help tsvarlist:time series variables} are allowed.  
@@ -20,7 +20,7 @@ Wrapper program for {cmd:domin} to conduct linear mixed effects regression domin
 {title:Description}
 
 {pstd}
-{cmd:mixdom} sets the data up in a way to allow for the dominance analysis of a linear mixed effects regression by utilizing {help xtmixed}.
+{cmd:mixdom} sets the data up in a way to allow for the dominance analysis of a linear mixed effects regression by utilizing {help mixed}.
 The method outlined here follows that for the within- and between-cluster Snijders and Bosker (1994) R2 metric described by Luo and Azen (2013). 
 
 {pstd}
@@ -35,14 +35,16 @@ Negative R2 values indicate model misspecification.
 {title:Options}
 
 {phang}{opt id()} specifies the variable on which clustering occurs and that will appear after the random effects specification (i.e., ||) in the 
-{cmd:xtmixed} syntax.
+{cmd:mixed} syntax.
 
-{phang}{opt remopt()} passes options to {cmd: xtmixed} specific to the random intercept effect (i.e., {opt pweight()} the user would 
+{phang}{opt remopt()} passes options to {cmd: mixed} specific to the random intercept effect (i.e., {opt pweight()} the user would 
 like to utilize during estimation.
 
-{phang}{opt xtmopt()} passes options to {cmd:xtmixed} that the user would like to utilize during estimation.
+{phang}{opt mopt()} passes options to {cmd:mixed} that the user would like to utilize during estimation.
+This option was named {opt xtmopt()} in {cmd:mixdom} versions previous to 2.0.  {opt xtmopt()} still works in 
+{cmd:mixdom} 2.0 but cannot be used with {opt mopt()}.
 
-{phang}{opt noconstant} does not estimate an average fixed-effect constant (see option {opt noconstant} of {help xtmixed}).
+{phang}{opt noconstant} does not estimate an average fixed-effect constant (see option {opt noconstant} of {help mixed}).
 
 {title:Saved results}
 
@@ -69,5 +71,5 @@ like to utilize during estimation.
 {title:Also see}
 
 {psee}
-{manhelp xtmixed R}.
+{manhelp mixed R}.
 {p_end}