diff --git a/lib/linguist/languages.yml b/lib/linguist/languages.yml
index 66d22263..4beaa7aa 100644
--- a/lib/linguist/languages.yml
+++ b/lib/linguist/languages.yml
@@ -1209,13 +1209,26 @@ Groff:
   extensions:
   - .man
   - '.1'
+  - .1in
+  - .1m
+  - .1x
   - '.2'
   - '.3'
+  - .3in
+  - .3m
+  - .3qt
+  - .3x
   - '.4'
   - '.5'
   - '.6'
   - '.7'
+  - '.8'
+  - '.9'
   - .l
+  - .ms
+  - .n
+  - .rno
+  - .roff
   tm_scope: text.groff
   aliases:
   - nroff