diff --git a/index.md b/index.md
index 8c3b610..c9d2c78 100644
--- a/index.md
+++ b/index.md
@@ -34,6 +34,15 @@ Tested with [nvi](https://en.wikipedia.org/wiki/Nvi) 1.79 and 2.1.3 (unicode).
+## Increment / Decrement number in command mode
+
+(1) move cursor to number
+(2a) increment by one: #+
+(2b) increment by N (5): 5#+
+(3a) decrement by one: #-
+(3b) decrement by N (9): 9#-
+
+
## Add # to a block
@@ -46,7 +55,7 @@ Tested with [nvi](https://en.wikipedia.org/wiki/Nvi) 1.79 and 2.1.3 (unicode). :'k,'ls/\ *$// -## Remove the first N characters from every line +## Remove the first N-characters from every line N = 5