diff --git a/lib/sw-precache.js b/lib/sw-precache.js
index 8faa8e0..4a319d8 100644
--- a/lib/sw-precache.js
+++ b/lib/sw-precache.js
@@ -188,47 +188,61 @@ function generate(params, callback) {
     });
 
     Object.keys(params.dynamicUrlToDependencies).forEach(function(dynamicUrl) {
-      if (!Array.isArray(params.dynamicUrlToDependencies[dynamicUrl])) {
+      var dependency = params.dynamicUrlToDependencies[dynamicUrl];
+      var isString = typeof dependency === 'string';
+
+      if (!Array.isArray(dependency) && !isString) {
         throw Error(util.format(
           'The value for the dynamicUrlToDependencies.%s ' +
-          'option must be an Array.',
+          'option must be an Array or a String.',
           dynamicUrl));
       }
 
-      var filesAndSizesAndHashes = params.dynamicUrlToDependencies[dynamicUrl]
-        .sort()
-        .map(function(file) {
-          try {
-            return getFileAndSizeAndHashForFile(file);
-          } catch (e) {
-            // Provide some additional information about the failure if the file is missing.
-            if (e.code === 'ENOENT') {
-              params.logger(util.format(
-                '%s was listed as a dependency for dynamic URL %s, but ' +
-                'the file does not exist. Either remove the entry as a ' +
-                'dependency, or correct the path to the file.',
-                file, dynamicUrl
-              ));
+      if (isString) {
+        cumulativeSize += dependency.length;
+        relativeUrlToHash[dynamicUrl] = getHash(dependency);
+      } else {
+        var filesAndSizesAndHashes = dependency
+          .sort()
+          .map(function(file) {
+            try {
+              return getFileAndSizeAndHashForFile(file);
+            } catch (e) {
+              // Provide some additional information about the failure if the file is missing.
+              if (e.code === 'ENOENT') {
+                params.logger(util.format(
+                  '%s was listed as a dependency for dynamic URL %s, but ' +
+                  'the file does not exist. Either remove the entry as a ' +
+                  'dependency, or correct the path to the file.',
+                  file, dynamicUrl
+                ));
+              }
+              // Re-throw the exception unconditionally, since this should be treated as fatal.
+              throw e;
             }
-            // Re-throw the exception unconditionally, since this should be treated as fatal.
-            throw e;
-          }
-        });
-      var concatenatedHashes = '';
+          });
+        var concatenatedHashes = '';
 
-      filesAndSizesAndHashes.forEach(function(fileAndSizeAndHash) {
-        // Let's assume that the response size of a server-generated page is roughly equal to the
-        // total size of all its components.
-        cumulativeSize += fileAndSizeAndHash.size;
-        concatenatedHashes += fileAndSizeAndHash.hash;
-      });
+        filesAndSizesAndHashes.forEach(function(fileAndSizeAndHash) {
+          // Let's assume that the response size of a server-generated page is roughly equal to the
+          // total size of all its components.
+          cumulativeSize += fileAndSizeAndHash.size;
+          concatenatedHashes += fileAndSizeAndHash.hash;
+        });
 
-      relativeUrlToHash[dynamicUrl] = getHash(concatenatedHashes);
+        relativeUrlToHash[dynamicUrl] = getHash(concatenatedHashes);
+      }
 
       if (params.verbose) {
-        params.logger(util.format(
-          'Caching dynamic URL "%s" with dependencies on %j',
-          dynamicUrl, params.dynamicUrlToDependencies[dynamicUrl]));
+        if (isString) {
+          params.logger(util.format(
+            'Caching dynamic URL "%s" with dependency on user-supplied string',
+            dynamicUrl));
+        } else {
+          params.logger(util.format(
+            'Caching dynamic URL "%s" with dependencies on %j',
+            dynamicUrl, dependency));
+        }
       }
     });