diff --git a/index.md b/index.md
index 76ff27f..9a3d54e 100644
--- a/index.md
+++ b/index.md
@@ -47,6 +47,14 @@ Helpful documents:
 
 	:%s/^.\{0,5\}//
 
+#### Delete all lines N (10) characters long
+
+	:g/^.\{10\}$/d
+
+#### Delete all lines _except_ N (10) characters long
+
+	:g!/^.\{10\}$/d
+
 #### Search and replace PATHs, using different delimiter
 
 	:%s#/usr/local/log#/var/log#g