diff --git a/core/database.class.php b/core/database.class.php
index da68d598..4c025839 100644
--- a/core/database.class.php
+++ b/core/database.class.php
@@ -318,6 +318,9 @@ class MemcacheCache implements CacheEngine {
 	public function set($key, $val, $time=0) {
 		assert(!is_null($key));
 		$this->memcache->set($key, $val, false, $time);
+		if((DEBUG_CACHE === true) || (is_null(DEBUG_CACHE) && @$_GET['DEBUG_CACHE'])) {
+			file_put_contents("data/cache.log", "Cache set: $key ($time)\n", FILE_APPEND);
+		}
 	}
 
 	/**
@@ -326,6 +329,9 @@ class MemcacheCache implements CacheEngine {
 	public function delete($key) {
 		assert(!is_null($key));
 		$this->memcache->delete($key);
+		if((DEBUG_CACHE === true) || (is_null(DEBUG_CACHE) && @$_GET['DEBUG_CACHE'])) {
+			file_put_contents("data/cache.log", "Cache delete: $key\n", FILE_APPEND);
+		}
 	}
 
 	/**