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diff --git a/docs/libcurl/opts/CURLOPT_HSTSREADDATA.md b/docs/libcurl/opts/CURLOPT_HSTSREADDATA.md
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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_HSTSREADDATA
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_HSTS (3)
+  - CURLOPT_HSTSREADFUNCTION (3)
+  - CURLOPT_HSTSWRITEDATA (3)
+  - CURLOPT_HSTSWRITEFUNCTION (3)
+---
+
+# NAME
+
+CURLOPT_HSTSREADDATA - pointer passed to the HSTS read callback
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_HSTSREADDATA, void *pointer);
+~~~
+
+# DESCRIPTION
+
+Data *pointer* to pass to the HSTS read function. If you use the
+CURLOPT_HSTSREADFUNCTION(3) option, this is the pointer you get as input
+in the 3rd argument to the callback.
+
+This option does not enable HSTS, you need to use CURLOPT_HSTS_CTRL(3) to
+do that.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+This feature is only used for HTTP(S) transfer.
+
+# EXAMPLE
+
+~~~c
+struct MyData {
+  void *custom;
+};
+
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  struct MyData this;
+  if(curl) {
+    curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
+
+    /* pass pointer that gets passed in to the
+       CURLOPT_HSTSREADFUNCTION callback */
+    curl_easy_setopt(curl, CURLOPT_HSTSREADDATA, &this);
+
+    curl_easy_perform(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Added in 7.74.0
+
+# RETURN VALUE
+
+This returns CURLE_OK.