diff --git a/docs/api-guide/status-codes.md b/docs/api-guide/status-codes.md
index fb2f9bf13..7fbc6a78a 100644
--- a/docs/api-guide/status-codes.md
+++ b/docs/api-guide/status-codes.md
@@ -123,6 +123,20 @@ Response status codes beginning with the digit "5" indicate cases in which the s
     HTTP_510_NOT_EXTENDED
     HTTP_511_NETWORK_AUTHENTICATION_REQUIRED
 
+    # Cloudflare-specific HTTP status codes
+    HTTP_520_UNKNOWN_ERROR = 520
+    HTTP_521_WEB_SERVER_IS_DOWN = 521
+    HTTP_522_CONNECTION_TIMED_OUT = 522
+    HTTP_523_ORIGIN_IS_UNREACHABLE = 523
+    HTTP_524_A_TIMEOUT_OCCURRED = 524
+    HTTP_525_SSL_HANDSHAKE_FAILED = 525
+    HTTP_526_INVALID_SSL_CERTIFICATE = 526
+    HTTP_527_RAILGUN_ERROR = 527
+    HTTP_530_ORIGIN_DNS_ERROR = 530
+    HTTP_531_ORIGIN_CONNECTION_TIMEOUT = 531
+    HTTP_532_ORIGIN_READ_TIMEOUT = 532
+    HTTP_533_ORIGIN_UNCERTAIN_ERROR = 533
+
 ## Helper functions
 
 The following helper functions are available for identifying the category of the response code.