diff --git a/src/gr/spinellis/umlgraph/test/DotDiff.java b/src/gr/spinellis/umlgraph/test/DotDiff.java
index d1d01fd..24106c4 100644
--- a/src/gr/spinellis/umlgraph/test/DotDiff.java
+++ b/src/gr/spinellis/umlgraph/test/DotDiff.java
@@ -169,7 +169,7 @@ public class DotDiff {
             if (openBrackedIdx < 0 && closedBracketIdx < 0 || line.startsWith("edge")
                     || line.startsWith("node"))
                 extraLines.add(line);
-            else if (arrowIdx > 0 && arrowIdx < openBrackedIdx) { // that's an
+            else if (arrowIdx > 0 && arrowIdx < openBrackedIdx) { // that's an arc
                 arcLines.add(line);
             } else { // that's a node
                 String attributes = line.substring(openBrackedIdx + 1, closedBracketIdx);
diff --git a/src/org/umlgraph/test/DotDiff.java b/src/org/umlgraph/test/DotDiff.java
index d1d01fd..24106c4 100644
--- a/src/org/umlgraph/test/DotDiff.java
+++ b/src/org/umlgraph/test/DotDiff.java
@@ -169,7 +169,7 @@ public class DotDiff {
             if (openBrackedIdx < 0 && closedBracketIdx < 0 || line.startsWith("edge")
                     || line.startsWith("node"))
                 extraLines.add(line);
-            else if (arrowIdx > 0 && arrowIdx < openBrackedIdx) { // that's an
+            else if (arrowIdx > 0 && arrowIdx < openBrackedIdx) { // that's an arc
                 arcLines.add(line);
             } else { // that's a node
                 String attributes = line.substring(openBrackedIdx + 1, closedBracketIdx);