diff --git a/include/PEGKit/PKParser.h b/include/PEGKit/PKParser.h
index 1b84a9f..fdf80fa 100644
--- a/include/PEGKit/PKParser.h
+++ b/include/PEGKit/PKParser.h
@@ -33,6 +33,11 @@ extern NSInteger PEGKitRecognitionErrorCode;
 extern NSString * const PEGKitRecognitionTokenMatchFailed;
 extern NSString * const PEGKitRecognitionPredicateFailed;
 
+/**
+ * Returned by the parse* methods if isEmptyOK is set and the input is empty.
+ */
+extern NSString * const PEGKitSuccessfulEmptyParse;
+
 typedef void (^PKSActionBlock)   (void);
 typedef void (^PKSSpeculateBlock)(void);
 typedef BOOL (^PKSPredicateBlock)(void);
@@ -72,4 +77,11 @@ enum {
 @property (nonatomic, assign) BOOL enableActions; // default YES
 @property (nonatomic, assign) BOOL enableAutomaticErrorRecovery; // default NO
 @property (nonatomic, assign) BOOL enableVerboseErrorReporting; // default NO
+
+/**
+ * Set this if you want to accept empty input.
+ * The parse* methods will return PEGKitSuccessfulEmptyParse in this case.
+ */
+@property (nonatomic) BOOL isEmptyOK;
+
 @end
diff --git a/res/PGClassImplementationTemplate.txt b/res/PGClassImplementationTemplate.txt
index 9e5a3fd..f5c1bf4 100644
--- a/res/PGClassImplementationTemplate.txt
+++ b/res/PGClassImplementationTemplate.txt
@@ -37,6 +37,18 @@
 {%/for%}}
 {%/if%}
 - (void)start {
+    if (!self.isEmptyOK || [self speculate:^{
+            [self startSpeculate];
+        }]) {
+        [self startSpeculate];
+    }
+    else {
+        [self matchEOF:YES];
+        PUSH(PEGKitSuccessfulEmptyParse);
+    }
+}
+
+- (void)startSpeculate {
 {{beforeAction}}
 {{startMethodBody}}
 {{afterAction}}}
diff --git a/src/PKParser.m b/src/PKParser.m
index 8b0b410..dd3f6e9 100644
--- a/src/PKParser.m
+++ b/src/PKParser.m
@@ -39,6 +39,7 @@
 NSInteger PEGKitRecognitionErrorCode = 1;
 NSString * const PEGKitRecognitionTokenMatchFailed = @"Failed to match next input token";
 NSString * const PEGKitRecognitionPredicateFailed = @"Predicate failed";
+NSString * const PEGKitSuccessfulEmptyParse = @"PEGKitSuccessfulEmptyParse";
 
 @interface NSObject ()
 - (void)parser:(PKParser *)p didFailToMatch:(PKAssembly *)a;