diff --git a/apps/multiplatform/common/src/commonMain/cpp/android/simplex-api.c b/apps/multiplatform/common/src/commonMain/cpp/android/simplex-api.c
index 54478425f1..4fd62524de 100644
--- a/apps/multiplatform/common/src/commonMain/cpp/android/simplex-api.c
+++ b/apps/multiplatform/common/src/commonMain/cpp/android/simplex-api.c
@@ -49,6 +49,13 @@ Java_chat_simplex_common_platform_CoreKt_initHS(__unused JNIEnv *env, __unused j
 // from simplex-chat
 typedef long* chat_ctrl;
 
+/*
+   When you start using any new function from Haskell libraries,
+   you have to add the function name to the file libsimplex.dll.def in the root directory.
+   And do the same by adding it into flake.nix file in the root directory,
+   Otherwise, Windows and Android libraries cannot be built.
+*/
+
 extern char *chat_migrate_init(const char *path, const char *key, const char *confirm, chat_ctrl *ctrl);
 extern char *chat_send_cmd(chat_ctrl ctrl, const char *cmd);
 extern char *chat_send_remote_cmd(chat_ctrl ctrl, const int rhId, const char *cmd);
diff --git a/apps/multiplatform/common/src/commonMain/cpp/desktop/simplex-api.c b/apps/multiplatform/common/src/commonMain/cpp/desktop/simplex-api.c
index 1c4ad1142e..fb561dc38d 100644
--- a/apps/multiplatform/common/src/commonMain/cpp/desktop/simplex-api.c
+++ b/apps/multiplatform/common/src/commonMain/cpp/desktop/simplex-api.c
@@ -22,6 +22,13 @@ Java_chat_simplex_common_platform_CoreKt_initHS(JNIEnv *env, jclass clazz) {
 // from simplex-chat
 typedef long* chat_ctrl;
 
+/*
+   When you start using any new function from Haskell libraries,
+   you have to add the function name to the file libsimplex.dll.def in the root directory.
+   And do the same by adding it into flake.nix file in the root directory,
+   Otherwise, Windows and Android libraries cannot be built.
+*/
+
 extern char *chat_migrate_init(const char *path, const char *key, const char *confirm, chat_ctrl *ctrl);
 extern char *chat_send_cmd(chat_ctrl ctrl, const char *cmd);
 extern char *chat_send_remote_cmd(chat_ctrl ctrl, const int rhId, const char *cmd);
diff --git a/libsimplex.dll.def b/libsimplex.dll.def
index 2d6e813d77..4255f4409c 100644
--- a/libsimplex.dll.def
+++ b/libsimplex.dll.def
@@ -1,6 +1,7 @@
 LIBRARY libsimplex
 EXPORTS
     hs_init
+    hs_init_with_rtsopts
     chat_migrate_init
     chat_send_cmd
     chat_send_remote_cmd