diff --git a/ov.yaml b/ov.yaml
index 5246b7b4..707f031b 100644
--- a/ov.yaml
+++ b/ov.yaml
@@ -2,6 +2,7 @@
 # Copy it to `$XDG_CONFIG_HOME/ov/config.yaml` or start it with `ov --config ov.yaml`.
 #
 # CaseSensitive: false
+# SmartCaseSensitive: false
 # RegexpSearch: false
 # Incsearch: true
 # BeforeWriteOriginal: 1000
diff --git a/oviewer/oviewer.go b/oviewer/oviewer.go
index 6cacf149..04ce27d4 100644
--- a/oviewer/oviewer.go
+++ b/oviewer/oviewer.go
@@ -189,6 +189,7 @@ type Config struct {
 	IsWriteOriginal          bool
 	QuitSmall                bool
 	CaseSensitive            bool
+	SmartCaseSensitive       bool
 	RegexpSearch             bool
 	Incsearch                bool
 	Debug                    bool
diff --git a/oviewer/search.go b/oviewer/search.go
index ba836737..acb98aa8 100644
--- a/oviewer/search.go
+++ b/oviewer/search.go
@@ -12,6 +12,7 @@ import (
 	"strconv"
 	"strings"
 	"sync/atomic"
+	"unicode"
 
 	"code.rocketnine.space/tslocum/cbind"
 	"github.com/gdamore/tcell/v2"
@@ -228,9 +229,20 @@ func (root *Root) setSearcher(word string, caseSensitive bool) Searcher {
 	}
 	root.input.value = word
 	root.searchWord = word
-	root.searchReg = regexpCompile(root.searchWord, caseSensitive)
 
-	return NewSearcher(root.searchWord, root.searchReg, caseSensitive, root.Config.RegexpSearch)
+	smartCaseSensitive := caseSensitive
+	if root.Config.SmartCaseSensitive {
+		smartCaseSensitive = false
+		for _, ch := range word {
+			if unicode.IsUpper(ch) {
+				smartCaseSensitive = true
+				break
+			}
+		}
+	}
+	root.searchReg = regexpCompile(root.searchWord, smartCaseSensitive)
+
+	return NewSearcher(root.searchWord, root.searchReg, smartCaseSensitive, root.Config.RegexpSearch)
 }
 
 // searchMove searches forward/backward and moves to the nearest matching line.
diff --git a/oviewer/search_test.go b/oviewer/search_test.go
index 051ddd98..44081020 100644
--- a/oviewer/search_test.go
+++ b/oviewer/search_test.go
@@ -474,6 +474,7 @@ func TestRoot_setSearch(t *testing.T) {
 		fields fields
 		args   args
 		want   Searcher
+		config Config
 	}{
 		{
 			name: "testNil",
@@ -499,11 +500,28 @@ func TestRoot_setSearch(t *testing.T) {
 				word: strings.ToLower("test"),
 			},
 		},
+		{
+			name: "testSmartCaseSensitiveTrue",
+			config: Config{
+				SmartCaseSensitive: true,
+			},
+			fields: fields{
+				input: &Input{},
+			},
+			args: args{
+				word:          "Test",
+				caseSensitive: false,
+			},
+			want: sensitiveWord{
+				word: "Test",
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
 			root := &Root{
 				input: tt.fields.input,
+				Config: tt.config,
 			}
 			if got := root.setSearcher(tt.args.word, tt.args.caseSensitive); !reflect.DeepEqual(got, tt.want) {
 				t.Errorf("Root.setSearch() = %v, want %v", got, tt.want)