diff --git a/crypto/spx/spx.c b/crypto/spx/spx.c
index 679a4a1..b5bec6e 100644
--- a/crypto/spx/spx.c
+++ b/crypto/spx/spx.c
@@ -16,11 +16,11 @@
 
 #include <string.h>
 
+#include <openssl/experimental/spx.h>
 #include <openssl/rand.h>
 
 #include "./address.h"
 #include "./fors.h"
-#include "./internal.h"
 #include "./merkle.h"
 #include "./params.h"
 #include "./spx_util.h"
diff --git a/crypto/spx/spx_test.cc b/crypto/spx/spx_test.cc
index f4ebcea..313f47d 100644
--- a/crypto/spx/spx_test.cc
+++ b/crypto/spx/spx_test.cc
@@ -21,8 +21,8 @@
 
 #include <gtest/gtest.h>
 #include <openssl/bytestring.h>
+#include <openssl/experimental/spx.h>
 
-#include "./internal.h"
 #include "../test/file_test.h"
 #include "../test/test_util.h"
 
diff --git a/crypto/spx/internal.h b/include/openssl/experimental/spx.h
similarity index 100%
rename from crypto/spx/internal.h
rename to include/openssl/experimental/spx.h
diff --git a/tool/speed.cc b/tool/speed.cc
index a8c0587..d524455 100644
--- a/tool/speed.cc
+++ b/tool/speed.cc
@@ -39,6 +39,7 @@
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/experimental/kyber.h>
+#include <openssl/experimental/spx.h>
 #include <openssl/hrss.h>
 #include <openssl/mem.h>
 #include <openssl/nid.h>
@@ -67,7 +68,6 @@
 #include "../crypto/fipsmodule/ec/internal.h"
 #include "../crypto/internal.h"
 #include "../crypto/trust_token/internal.h"
-#include "../crypto/spx/internal.h"
 #include "internal.h"
 
 // g_print_json is true if printed output is JSON formatted.
diff --git a/util/doc.config b/util/doc.config
index ec640f5..213831a 100644
--- a/util/doc.config
+++ b/util/doc.config
@@ -62,7 +62,8 @@
   },{
     "Name": "Experimental primitives. Will be removed and replaced when standardized!",
     "Headers": [
-      "include/openssl/experimental/kyber.h"
+      "include/openssl/experimental/kyber.h",
+      "include/openssl/experimental/spx.h"
     ]
   },{
     "Name": "SSL implementation",