diff --git a/library/core/src/main/java/com/google/android/exoplayer2/upstream/DataSpec.java b/library/core/src/main/java/com/google/android/exoplayer2/upstream/DataSpec.java
index acf5550427..c090c2ff62 100644
--- a/library/core/src/main/java/com/google/android/exoplayer2/upstream/DataSpec.java
+++ b/library/core/src/main/java/com/google/android/exoplayer2/upstream/DataSpec.java
@@ -35,14 +35,19 @@ public final class DataSpec {
 
   /**
    * The flags that apply to any request for data. Possible flag values are {@link
-   * #FLAG_ALLOW_GZIP}, {@link #FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN} and {@link
-   * #FLAG_ALLOW_CACHE_FRAGMENTATION}.
+   * #FLAG_ALLOW_GZIP}, {@link #FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN}, {@link
+   * #FLAG_ALLOW_CACHE_FRAGMENTATION}, and {@link #FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED}.
    */
   @Documented
   @Retention(RetentionPolicy.SOURCE)
   @IntDef(
       flag = true,
-      value = {FLAG_ALLOW_GZIP, FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN, FLAG_ALLOW_CACHE_FRAGMENTATION})
+      value = {
+        FLAG_ALLOW_GZIP,
+        FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN,
+        FLAG_ALLOW_CACHE_FRAGMENTATION,
+        FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED
+      })
   public @interface Flags {}
   /**
    * Allows an underlying network stack to request that the server use gzip compression.
@@ -57,14 +62,19 @@ public final class DataSpec {
    */
   public static final int FLAG_ALLOW_GZIP = 1;
   /** Prevents caching if the length cannot be resolved when the {@link DataSource} is opened. */
-  public static final int FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN = 1 << 1; // 2
+  public static final int FLAG_DONT_CACHE_IF_LENGTH_UNKNOWN = 1 << 1;
   /**
    * Allows fragmentation of this request into multiple cache files, meaning a cache eviction policy
    * will be able to evict individual fragments of the data. Depending on the cache implementation,
    * setting this flag may also enable more concurrent access to the data (e.g. reading one fragment
    * whilst writing another).
    */
-  public static final int FLAG_ALLOW_CACHE_FRAGMENTATION = 1 << 2; // 4
+  public static final int FLAG_ALLOW_CACHE_FRAGMENTATION = 1 << 2;
+  /**
+   * Indicates there are known external factors that might prevent the data from being loaded at
+   * full network speed (e.g. server throttling or unfinished live media chunks).
+   */
+  public static final int FLAG_MIGHT_NOT_USE_FULL_NETWORK_SPEED = 1 << 3;
 
   /**
    * The set of HTTP methods that are supported by ExoPlayer {@link HttpDataSource}s. One of {@link