diff --git a/lib/compiler.js b/lib/compiler.js
index 4e31734..fcb7782 100644
--- a/lib/compiler.js
+++ b/lib/compiler.js
@@ -64,9 +64,9 @@ PEG.Grammar.GrammarError.prototype = Error.prototype;
 
 /* ===== PEG.Grammar.* ===== */
 
-PEG.Grammar.Rule = function(name, humanName, expression) {
+PEG.Grammar.Rule = function(name, displayName, expression) {
   this._name = name;
-  this._humanName = humanName;
+  this._displayName = displayName;
   this._expression = expression;
 };
 
@@ -239,7 +239,7 @@ PEG.Compiler = {
 PEG.Grammar.Rule.prototype.compile = function() {
   var resultVar = PEG.Compiler.generateUniqueIdentifier("result");
 
-  if (this._humanName !== null) {
+  if (this._displayName !== null) {
     var setReportMatchFailuresCode = PEG.Compiler.formatCode(
       "var savedReportMatchFailures = context.reportMatchFailures;",
       "context.reportMatchFailures = false;"
@@ -249,10 +249,10 @@ PEG.Grammar.Rule.prototype.compile = function() {
     );
     var reportMatchFailureCode = PEG.Compiler.formatCode(
       "if (context.reportMatchFailures && ${resultVar} === null) {",
-      "  this._matchFailed(new PEG.Parser.NamedRuleMatchFailure(${humanName|string}));",
+      "  this._matchFailed(new PEG.Parser.NamedRuleMatchFailure(${displayName|string}));",
       "}",
       {
-        humanName: this._humanName,
+        displayName: this._displayName,
         resultVar: resultVar
       }
     );
diff --git a/lib/runtime.js b/lib/runtime.js
index 7f76bfd..592d42e 100644
--- a/lib/runtime.js
+++ b/lib/runtime.js
@@ -218,10 +218,12 @@ PEG.Parser.AnyMatchFailure.prototype = {
 
 /* Stores information about a failure to match a named rule. */
 
-PEG.Parser.NamedRuleMatchFailure = function(humanName) { this._humanName = humanName; }
+PEG.Parser.NamedRuleMatchFailure = function(displayName) {
+  this._displayName = displayName;
+}
 
 PEG.Parser.NamedRuleMatchFailure.prototype = {
-  toString: function() { return this._humanName; }
+  toString: function() { return this._displayName; }
 };
 
 /* ===== PEG.Parser.SyntaxError ===== */