diff --git a/Parser.js b/Parser.js
index bbdfaf5b..54357c87 100644
--- a/Parser.js
+++ b/Parser.js
@@ -268,6 +268,7 @@ var copyFuncs = {
     ],
     "rel": [
         "rel",
+        "\\approx",
         "\\geq",
         "\\gets",
         "\\leftarrow",
diff --git a/buildTree.js b/buildTree.js
index 066d4f76..1c99c9b4 100644
--- a/buildTree.js
+++ b/buildTree.js
@@ -419,6 +419,7 @@ var charLookup = {
     "\\$": "$",
     "\\%": "%",
     "\\angle": "\u2220",
+    "\\approx": "\u2248",
     "\\cdot": "\u22c5",
     "\\circ": "\u2218",
     "\\colon": ":",