diff --git a/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/FileResource.java b/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/FileResource.java
index 69ed1a412..4636bdaf3 100644
--- a/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/FileResource.java
+++ b/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/FileResource.java
@@ -109,4 +109,12 @@ public class FileResource extends Resource {
         }
     }
 
+    @Override
+    public String toString() {
+        return "[" +
+                "file=" + getFile() + "," +
+                "len=" + length() +
+                ']';
+    }
+
 }
diff --git a/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/HeapResource.java b/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/HeapResource.java
index 8a23e3916..a632f5266 100644
--- a/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/HeapResource.java
+++ b/httpclient5-cache/src/main/java/org/apache/hc/client5/http/impl/cache/HeapResource.java
@@ -74,4 +74,12 @@ public class HeapResource extends Resource {
         this.arrayRef.set(null);
     }
 
+    @Override
+    public String toString() {
+        return "[" +
+                "heap," +
+                "len=" + length() +
+                ']';
+    }
+
 }