diff --git a/IPython/utils/_process_emscripten.py b/IPython/utils/_process_emscripten.py
index 6853dc1..cbab32d 100644
--- a/IPython/utils/_process_emscripten.py
+++ b/IPython/utils/_process_emscripten.py
@@ -1,3 +1,8 @@
+"""Emscripten-specific implementation of process utilities.
+
+This file is only meant to be imported by process.py, not by end-users.
+"""
+
 def system(cmd):
     raise OSError("Not available")