diff --git a/README.md b/README.md
index e73744d..721ce79 100644
--- a/README.md
+++ b/README.md
@@ -38,6 +38,7 @@ $ isac
 |C-u|power on current row's server|
 |C-r|refresh rows|
 |BackSpace, C-b, C-h|delete a filter character|
+|C-a|delete all filter characters|
 |C-s|sort rows|
 |C-/|show help|
 |Enter|show current row's detail|
diff --git a/lib/isac.go b/lib/isac.go
index 9fb8b48..73e897c 100644
--- a/lib/isac.go
+++ b/lib/isac.go
@@ -97,6 +97,8 @@ MAINLOOP:
 			case termbox.KeyCtrlSlash:
 				i.state.Toggle("help")
 				i.draw("")
+			case termbox.KeyCtrlA:
+				i.removeRuneAllFromFilter()
 			case termbox.KeyBackspace2, termbox.KeyCtrlB, termbox.KeyCtrlH:
 				i.removeRuneFromFilter()
 			case termbox.KeyCtrlS:
@@ -150,6 +152,7 @@ func (i *Isac) draw(message string) {
 			"<C-u>                    power on current row's server",
 			"<C-r>                    refresh rows",
 			"<BackSpace>, C-b>, <C-h> delete a filter character",
+			"<C-a>                    delete all filter characters",
 			"<C-s>                    sort rows",
 			"<C-/>                    show help",
 			"<Enter>                  show current row's detail",
@@ -338,3 +341,8 @@ func (i *Isac) removeRuneFromFilter() {
 
 	i.draw("")
 }
+
+func (i *Isac) removeRuneAllFromFilter() {
+	i.filter = ""
+	i.draw("")
+}