diff --git a/src/main/java/com/google/gerrit/client/data/SparseFileContent.java b/src/main/java/com/google/gerrit/client/data/SparseFileContent.java
index 2f0974f..d226127 100644
--- a/src/main/java/com/google/gerrit/client/data/SparseFileContent.java
+++ b/src/main/java/com/google/gerrit/client/data/SparseFileContent.java
@@ -108,6 +108,19 @@
     return ranges.get(ranges.size() - 1);
   }
 
+  @Override
+  public String toString() {
+    final StringBuilder b = new StringBuilder();
+    b.append("SparseFileContent[\n");
+    for (Range r : ranges) {
+      b.append("  ");
+      b.append(r.toString());
+      b.append('\n');
+    }
+    b.append("]");
+    return b.toString();
+  }
+
   static class Range {
     protected int base;
     protected List<String> lines;
@@ -131,5 +144,10 @@
     private boolean contains(final int i) {
       return base <= i && i < end();
     }
+
+    @Override
+    public String toString() {
+      return "Range[" + base + "," + end() + ")";
+    }
   }
 }