diff --git a/cmdline/mingw.h b/cmdline/mingw.h
index d5cd2c39..79f45b10 100644
--- a/cmdline/mingw.h
+++ b/cmdline/mingw.h
@@ -441,12 +441,18 @@ int windows_cond_destroy(windows_cond_t* cond);
 int windows_cond_signal(windows_cond_t* cond);
 int windows_cond_broadcast(windows_cond_t* cond);
 int windows_cond_wait(windows_cond_t* cond, windows_mutex_t* mutex);
+int windows_create(thread_id_t* thread, void* attr, void* (*func)(void*), void* arg);
+int windows_join(thread_id_t thread, void** retval);
+
+/**
+ * Windows thread variables
+ *
+ * WARNING: windows_key_create and windows_key_delete must be called from a monothread context
+ */
 int windows_key_create(windows_key_t* key, void (*destructor)(void*));
 int windows_key_delete(windows_key_t key);
 void* windows_getspecific(windows_key_t key);
 int windows_setspecific(windows_key_t key, void* value);
-int windows_create(thread_id_t* thread, void* attr, void* (*func)(void*), void* arg);
-int windows_join(thread_id_t thread, void** retval);
 
 #endif
 #endif