diff --git a/NAMESPACE b/NAMESPACE
index 51e0929..7623e4a 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -35,6 +35,7 @@ importFrom(stats,coef)
 importFrom(stats,ecdf)
 importFrom(stats,integrate)
 importFrom(stats,nls)
+importFrom(stats,nls.control)
 importFrom(stats,optim)
 importFrom(stats,plot.ecdf)
 importFrom(stats,ppoints)
diff --git a/R/cdfe.R b/R/cdfe.R
index 2400522..340c571 100644
--- a/R/cdfe.R
+++ b/R/cdfe.R
@@ -3,11 +3,12 @@
 #' Triangle parameter estimates using a non-linear fit of the empirical CDF
 #'
 #' @param x the triangle distributed sample
+#' @param control an object created by \code{stats::nls.control}
 #'
 #' @return an object of class \code{nls}
 #' @export
 #'
-#' @importFrom stats nls
+#' @importFrom stats nls nls.control
 #'
 #' @examples
 #' set.seed(10304)
@@ -17,9 +18,9 @@
 #' summary(cdfe)
 #' coef(cdfe)
 #' \dontrun{
-#'   MASS::confint(cdfe)
+#'   confint(cdfe)
 #' }
-triangle_cdfe <- function(x)
+triangle_cdfe <- function(x, control = stats::nls.control(maxiter = 100, warnOnly = TRUE))
 {
   # x <- rtriangle(100, 0, 1, .3)
   n <- length(x)
@@ -35,6 +36,7 @@ triangle_cdfe <- function(x)
               c = 3*mean(x) - minx - maxx),
     algorithm = "port",
     lower = c(minx - 2*rangex, maxx, minx),
-    upper = c(minx, maxx + 2*rangex, maxx))
+    upper = c(minx, maxx + 2*rangex, maxx),
+    control = control)
   return(nls1)
 }
diff --git a/docs/articles/triangledistributionmath.html b/docs/articles/triangledistributionmath.html
index 1f2f32d..30b0283 100644
--- a/docs/articles/triangledistributionmath.html
+++ b/docs/articles/triangledistributionmath.html
@@ -86,7 +86,7 @@ <h1 data-toc-skip>Triangle Distribution Math</h1>
                         <h4 data-toc-skip class="author">Rob
 Carnell</h4>
             
-            <h4 data-toc-skip class="date">2022-12-11</h4>
+            <h4 data-toc-skip class="date">2022-12-12</h4>
       
       <small class="dont-index">Source: <a href="https://github.com/bertcarnell/triangle/blob/HEAD/vignettes/triangledistributionmath.Rmd" class="external-link"><code>vignettes/triangledistributionmath.Rmd</code></a></small>
       <div class="hidden name"><code>triangledistributionmath.Rmd</code></div>
diff --git a/docs/pkgdown.yml b/docs/pkgdown.yml
index d8e585f..7bfc201 100644
--- a/docs/pkgdown.yml
+++ b/docs/pkgdown.yml
@@ -3,5 +3,5 @@ pkgdown: 2.0.6
 pkgdown_sha: ~
 articles:
   triangledistributionmath: triangledistributionmath.html
-last_built: 2022-12-12T02:13Z
+last_built: 2022-12-13T00:58Z
 
diff --git a/docs/reference/triangle_cdfe.html b/docs/reference/triangle_cdfe.html
index dd79d56..4dd90e7 100644
--- a/docs/reference/triangle_cdfe.html
+++ b/docs/reference/triangle_cdfe.html
@@ -60,7 +60,7 @@ <h1>Triangle parameter estimates using a non-linear fit of the empirical CDF</h1
     </div>
 
     <div id="ref-usage">
-    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">triangle_cdfe</span><span class="op">(</span><span class="va">x</span><span class="op">)</span></span></code></pre></div>
+    <div class="sourceCode"><pre class="sourceCode r"><code><span><span class="fu">triangle_cdfe</span><span class="op">(</span><span class="va">x</span>, control <span class="op">=</span> <span class="fu">stats</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/stats/nls.control.html" class="external-link">nls.control</a></span><span class="op">(</span>maxiter <span class="op">=</span> <span class="fl">100</span>, warnOnly <span class="op">=</span> <span class="cn">TRUE</span><span class="op">)</span><span class="op">)</span></span></code></pre></div>
     </div>
 
     <div id="arguments">
@@ -68,6 +68,10 @@ <h2>Arguments</h2>
     <dl><dt>x</dt>
 <dd><p>the triangle distributed sample</p></dd>
 
+
+<dt>control</dt>
+<dd><p>an object created by <code><a href="https://rdrr.io/r/stats/nls.control.html" class="external-link">stats::nls.control</a></code></p></dd>
+
 </dl></div>
     <div id="value">
     <h2>Value</h2>
@@ -112,7 +116,7 @@ <h2>Examples</h2>
 <span class="r-out co"><span class="r-pr">#&gt;</span>         a         b         c </span>
 <span class="r-out co"><span class="r-pr">#&gt;</span> 0.7848163 5.3555055 2.1058729 </span>
 <span class="r-in"><span><span class="kw">if</span> <span class="op">(</span><span class="cn">FALSE</span><span class="op">)</span> <span class="op">{</span></span></span>
-<span class="r-in"><span>  <span class="fu">MASS</span><span class="fu">::</span><span class="fu">confint</span><span class="op">(</span><span class="va">cdfe</span><span class="op">)</span></span></span>
+<span class="r-in"><span>  <span class="fu"><a href="https://rdrr.io/r/stats/confint.html" class="external-link">confint</a></span><span class="op">(</span><span class="va">cdfe</span><span class="op">)</span></span></span>
 <span class="r-in"><span><span class="op">}</span></span></span>
 </code></pre></div>
     </div>
diff --git a/man/triangle_cdfe.Rd b/man/triangle_cdfe.Rd
index 8ec86a1..9265779 100644
--- a/man/triangle_cdfe.Rd
+++ b/man/triangle_cdfe.Rd
@@ -4,10 +4,12 @@
 \alias{triangle_cdfe}
 \title{Triangle parameter estimates using a non-linear fit of the empirical CDF}
 \usage{
-triangle_cdfe(x)
+triangle_cdfe(x, control = stats::nls.control(maxiter = 100, warnOnly = TRUE))
 }
 \arguments{
 \item{x}{the triangle distributed sample}
+
+\item{control}{an object created by \code{stats::nls.control}}
 }
 \value{
 an object of class \code{nls}
@@ -23,6 +25,6 @@ print(cdfe)
 summary(cdfe)
 coef(cdfe)
 \dontrun{
-  MASS::confint(cdfe)
+  confint(cdfe)
 }
 }
diff --git a/tests/testthat/test-fit-plots.R b/tests/testthat/test-fit-plots.R
index b7c0a4f..02c0dd3 100644
--- a/tests/testthat/test-fit-plots.R
+++ b/tests/testthat/test-fit-plots.R
@@ -1,11 +1,13 @@
 test_that("qqtriangle works", {
-  xtest <- c(0.1, 0.25, 0.3, 0.4, 0.45, 0.6, 0.75, 0.8)
+  set.seed(10304)
+  xtest <- rtriangle(100, 1, 5, 2)
   theta <- coef(triangle_mle(xtest))
   expect_no_error(qqtriangle(xtest, theta[1], theta[2], theta[3]))
 })
 
 test_that("compare_triangle_fit works", {
-  xtest <- c(0.1, 0.25, 0.3, 0.4, 0.45, 0.6, 0.75, 0.8)
+  set.seed(10304)
+  xtest <- rtriangle(100, 1, 5, 2)
   expect_no_error(compare_triangle_fit(xtest))
 })