diff --git a/cmd/grumble/grumble.go b/cmd/grumble/grumble.go
index 1f410fe..6807165 100644
--- a/cmd/grumble/grumble.go
+++ b/cmd/grumble/grumble.go
@@ -30,7 +30,7 @@ func main() {
 	// Open the data dir to check whether it exists.
 	dataDir, err := os.Open(Args.DataDir)
 	if err != nil {
-		log.Fatalf("Unable to open data directory: %v", err)
+		log.Fatalf("Unable to open data directory (%v): %v", Args.DataDir, err)
 		return
 	}
 	dataDir.Close()
@@ -38,7 +38,7 @@ func main() {
 	// Set up logging
 	err = logtarget.Target.OpenFile(Args.LogPath)
 	if err != nil {
-		fmt.Fprintf(os.Stderr, "Unable to open log file: %v", err)
+		fmt.Fprintf(os.Stderr, "Unable to open log file (%v): %v", Args.LogPath, err)
 		return
 	}
 	log.SetPrefix("[G] ")
@@ -56,7 +56,7 @@ func main() {
 	blobDir := filepath.Join(Args.DataDir, "blob")
 	err = os.Mkdir(blobDir, 0700)
 	if err != nil && !os.IsExist(err) {
-		log.Fatalf("Unable to create blob directory: %v", err)
+		log.Fatalf("Unable to create blob directory (%v): %v", blobDir, err)
 	}
 	blobStore = blobstore.Open(blobDir)