diff --git a/common/os/os.h b/common/os/os.h
index fce21de..18e61e2 100644
--- a/common/os/os.h
+++ b/common/os/os.h
@@ -27,6 +27,9 @@
  * Get home directory. If HOME environment variable is set then it is returned.
  * Otherwise home directory is obtained via getpwuid function.
  *
+ * Note for Windows:
+ * This functions returns array of TCHARs, not array of chars.
+ *
  * Returns:
  * 0 - Success
  * -1 - Failure