diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 350cc0d2..b2f51324 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1051,8 +1051,8 @@ PowerShell:
   - posh
   primary_extension: .ps1
   extensions:
-  - .psm1
   - .psd1
+  - .psm1
 
 Processing:
   type: programming
@@ -1437,6 +1437,7 @@ XML:
   - .mxml
   - .plist
   - .pt
+  - .psc1
   - .ps1xml
   - .rdf
   - .rss