2 files changed, 4 insertions, 0 deletions
diff --git a/include/curl/curl.h b/include/curl/curl.h
index 69283eb08..7cab0a16c 100644
--- a/include/curl/curl.h
+++ b/include/curl/curl.h
@@ -577,6 +577,8 @@ typedef enum {
   CURLE_SSL_INVALIDCERTSTATUS,   /* 91 - invalid certificate status */
   CURLE_HTTP2_STREAM,            /* 92 - stream error in HTTP/2 framing layer
                                     */
+  CURLE_RECURSIVE_API_CALL,      /* 93 - an api function was called from
+                                    inside a callback */
   CURL_LAST /* never use! */
 } CURLcode;
 
diff --git a/include/curl/multi.h b/include/curl/multi.h
index 911c91dd1..bd106ae85 100644
--- a/include/curl/multi.h
+++ b/include/curl/multi.h
@@ -70,6 +70,8 @@ typedef enum {
   CURLM_UNKNOWN_OPTION,  /* curl_multi_setopt() with unsupported option */
   CURLM_ADDED_ALREADY,   /* an easy handle already added to a multi handle was
                             attempted to get added - again */
+  CURLM_RECURSIVE_API_CALL, /* an api function was called from inside a
+                               callback */
   CURLM_LAST
 } CURLMcode;