diff --git a/PBGitRepository.h b/PBGitRepository.h
index 63c4972..021378d 100644
--- a/PBGitRepository.h
+++ b/PBGitRepository.h
@@ -8,12 +8,13 @@
 
 #import <Cocoa/Cocoa.h>
 #import "PBGitRevList.h"
+#import "PBGitRevSpecifier.h"
 
 extern NSString* PBGitRepositoryErrorDomain;
 
 @interface PBGitRepository : NSDocument {
 	PBGitRevList* revisionList;
-	NSArray* branches;
+	NSMutableArray* branches;
 	NSIndexSet* currentBranch;
 	NSDictionary* refs;
 }
@@ -25,6 +26,8 @@ extern NSString* PBGitRepositoryErrorDomain;
 
 - (void) readRefs;
 - (void) readCurrentBranch;
+- (void) addBranch: (PBGitRevSpecifier*) rev;
+- (void) selectBranch: (PBGitRevSpecifier*) rev;
 
 - (NSString*) parseSymbolicReference:(NSString*) ref;
 - (NSString*) parseReference:(NSString*) ref;
@@ -35,7 +38,7 @@ extern NSString* PBGitRepositoryErrorDomain;
 - (id) initWithURL: (NSURL*) path andArguments:(NSArray*) array;
 
 @property (retain) PBGitRevList* revisionList;
-@property (assign) NSArray* branches;
+@property (assign) NSMutableArray* branches;
 @property (assign) NSIndexSet* currentBranch;
 @property (assign) NSDictionary* refs;
 @end
diff --git a/PBGitRepository.m b/PBGitRepository.m
index e23f0a4..6a15b55 100644
--- a/PBGitRepository.m
+++ b/PBGitRepository.m
@@ -183,6 +183,23 @@ static NSString* gitPath;
 	self.refs = newRefs;
 }
 
+- (void) addBranch: (PBGitRevSpecifier*) rev
+{
+	[branches addObject: rev];
+}
+
+- (void) selectBranch: (PBGitRevSpecifier*) rev
+{
+	int i;
+	for (i = 0; i < [branches count]; i++) {
+		PBGitRevSpecifier* aRev = [branches objectAtIndex:i];
+		if (rev == aRev) {
+			self.currentBranch = [NSIndexSet indexSetWithIndex:i];
+			return;
+		}
+	}
+}
+
 - (void) readCurrentBranch
 {
 	NSString* branch = [self parseSymbolicReference: @"HEAD"];