diff --git a/src/buildHTML.js b/src/buildHTML.js
index 11faf4088..98903252e 100644
--- a/src/buildHTML.js
+++ b/src/buildHTML.js
@@ -32,7 +32,8 @@ var buildExpression = function(expression, options, prev) {
     return groups;
 };
 
-// List of types used by getTypeOfGroup
+// List of types used by getTypeOfGroup,
+// see https://github.com/Khan/KaTeX/wiki/Examining-TeX#group-types
 var groupToType = {
     mathord: "mord",
     textord: "mord",
@@ -43,7 +44,7 @@ var groupToType = {
     close: "mclose",
     inner: "minner",
     genfrac: "mord",
-    array: "minner",
+    array: "mord",
     spacing: "mord",
     punct: "mpunct",
     ordgroup: "mord",
@@ -615,7 +616,7 @@ var groupTypes = {
             }
         }
         body = makeSpan(["mtable"], cols);
-        return makeSpan(["minner"], [body], options.getColor());
+        return makeSpan(["mord"], [body], options.getColor());
     },
 
     spacing: function(group, options, prev) {
diff --git a/src/symbols.js b/src/symbols.js
index b620d730f..b5d8f6cf4 100644
--- a/src/symbols.js
+++ b/src/symbols.js
@@ -7,6 +7,7 @@
      normal font), or "ams" (the ams fonts).
  * - group (required): the ParseNode group type the symbol should have (i.e.
      "textord", "mathord", etc).
+     See https://github.com/Khan/KaTeX/wiki/Examining-TeX#group-types
  * - replace (optional): the character that this symbol or function should be
  *   replaced with (i.e. "\phi" has a replace value of "\u03d5", the phi
  *   character in the main font).
diff --git a/test/screenshotter/images/ArrayType-firefox.png b/test/screenshotter/images/ArrayType-firefox.png
new file mode 100644
index 000000000..c108bf123
Binary files /dev/null and b/test/screenshotter/images/ArrayType-firefox.png differ
diff --git a/test/screenshotter/ss_data.json b/test/screenshotter/ss_data.json
index e5f9359f2..deaf70c4c 100644
--- a/test/screenshotter/ss_data.json
+++ b/test/screenshotter/ss_data.json
@@ -1,6 +1,7 @@
 {
     "Accents": "http://localhost:7936/test/screenshotter/test.html?m=\\vec{A}\\vec{x}\\vec x^2\\vec{x}_2^2\\vec{A}^2\\vec{xA}^2",
     "Arrays": "http://localhost:7936/test/screenshotter/test.html?m=\\left(\\begin{array}{rlc}1%262%263\\\\1+1%262+1%263+1\\cr1\\over2%26\\scriptstyle 1/2%26\\frac12\\\\[1ex]\\begin{pmatrix}x\\\\y\\end{pmatrix}%260%26\\begin{vmatrix}a%26b\\\\c%26d\\end{vmatrix}\\end{array}\\right]",
+    "ArrayType": "http://localhost:7936/test/screenshotter/test.html?m=1\\begin{array}{c}2\\\\3\\end{array}4",
     "Baseline": "http://localhost:7936/test/screenshotter/test.html?m=a+b-c\\cdot d/e",
     "BasicTest": "http://localhost:7936/test/screenshotter/test.html?m=a",
     "BinomTest": "http://localhost:7936/test/screenshotter/test.html?m=\\dbinom{a}{b}\\tbinom{a}{b}^{\\binom{a}{b}+17}",