[#135] Inform of the completion loading order

modules/completion/README.md

@@ -7,8 +7,11 @@ Loads and configures tab completion and provides additional completions from the
 Contributors
 ------------
 
-Completions should be submitted to the [zsh-completions][1] project according to its
+Completions should be submitted to the [zsh-completions][1] project according
-rules and regulations. This module will be synched against it.
+to its rules and regulations. This module will be synched against it.
+
+This module must be loaded **after** the *alias* module but **before** the
+*utility* module.
 
 Authors
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