diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7ea5aa7..509259f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+### 1.2.0
+
+- Add `ignoreCase` flag support to `span` function (#18)
+
 ### 1.1.0
 
 - Add `lineBackground` and `lineHeight` for Android Q
diff --git a/README.md b/README.md
index 5e82da2..37c4b9e 100644
--- a/README.md
+++ b/README.md
@@ -94,13 +94,13 @@ Spans:
 
 Text manipulation:
 
-| Methods                           | Description                                    |
-| ---------------                   | ---------------------------                    |
-| append(text, spans...)            | appends text                                   |
-| append(image(...))                | appends image                                  |
-| replace(search, replace, spans...)| search and replace text                        |
-| span(search, spans...)            | search text and apply spans                    |
-| insert(pos, text, spans...)       | insert given text in given position            |
+| Methods                                   | Description                                    |
+| ---------------                           | ---------------------------                    |
+| append(text, spans...)                    | appends text                                   |
+| append(image(...))                        | appends image                                  |
+| replace(search, replace, spans...)        | search and replace text                        |
+| span(search, ignoreCase = false, spans...)| search text and apply spans                    |
+| insert(pos, text, spans...)               | insert given text in given position            |
 
 #### How to use
 ```
diff --git a/lib/src/main/java/lt/neworld/spanner/Spanner.kt b/lib/src/main/java/lt/neworld/spanner/Spanner.kt
index 6447c27..63bce94 100644
--- a/lib/src/main/java/lt/neworld/spanner/Spanner.kt
+++ b/lib/src/main/java/lt/neworld/spanner/Spanner.kt
@@ -15,7 +15,7 @@ class Spanner(text: CharSequence?) : SpannableStringBuilder(text) {
         return this
     }
 
-    override fun append(text: CharSequence, start: Int, end: Int): Spanner {
+    override fun append(text: CharSequence?, start: Int, end: Int): Spanner {
         super.append(text, start, end)
 
         return this
@@ -131,19 +131,41 @@ class Spanner(text: CharSequence?) : SpannableStringBuilder(text) {
         return this
     }
 
+    fun span(search: CharSequence, ignoreCase: Boolean = false, vararg spans: Span): Spanner {
+        span(0, search, ignoreCase, *spans)
+
+        return this
+    }
+
     fun span(startIndex: Int, search: CharSequence, vararg spans: Span): Spanner {
+        return span(startIndex, search, false, *spans)
+    }
+
+    fun span(startIndex: Int, search: CharSequence, ignoreCase: Boolean = false, vararg spans: Span): Spanner {
         if (TextUtils.isEmpty(search)) {
             setSpans(0, length, *spans)
             return this
         }
 
+        val actualSearch = if (ignoreCase) {
+            (search.toString() as java.lang.String).toLowerCase()
+        } else {
+            search
+        }
+
+        val actualThis = if (ignoreCase) {
+            (toString() as java.lang.String).toLowerCase()
+        } else {
+            this
+        }
+
         var lastPos: Int = startIndex - 1
 
         while (true) {
-            lastPos = TextUtils.indexOf(this, search, lastPos + 1)
+            lastPos = TextUtils.indexOf(actualThis, actualSearch, lastPos + 1)
             if (lastPos == -1) break
 
-            setSpans(lastPos, lastPos + search.length, *spans)
+            setSpans(lastPos, lastPos + actualSearch.length, *spans)
         }
 
         return this
diff --git a/lib/src/test/java/lt/neworld/spanner/SpannerTest.kt b/lib/src/test/java/lt/neworld/spanner/SpannerTest.kt
index e8221d9..8a4df3b 100644
--- a/lib/src/test/java/lt/neworld/spanner/SpannerTest.kt
+++ b/lib/src/test/java/lt/neworld/spanner/SpannerTest.kt
@@ -6,7 +6,6 @@ import org.junit.Assert.assertEquals
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.robolectric.RobolectricTestRunner
-import java.lang.StringBuilder
 
 /**
  * @author Andrius Semionovas
@@ -110,8 +109,21 @@ class SpannerTest {
         assertSpans("foo <StyleSpan>bar</StyleSpan>", Spanner().append("foo bar").span("bar", bold()))
         assertSpans("foo", Spanner().append("foo").span("bar", bold()))
         assertSpans(
-                "<StyleSpan>bar</StyleSpan> foo <StyleSpan>bar</StyleSpan>",
-                Spanner().append("bar foo bar").span("bar", bold())
+                expected = "<StyleSpan>bar</StyleSpan> foo <StyleSpan>bar</StyleSpan>",
+                actual = Spanner().append("bar foo bar").span("bar", bold())
+        )
+    }
+
+    @Test
+    fun span_text_ignoreCase() {
+        assertSpans(
+                expected = "foo <StyleSpan>BAR</StyleSpan>",
+                actual = Spanner("foo BAR").span("bar", ignoreCase = true, spans = bold())
+        )
+        assertSpans("foo", Spanner().append("foo").span("bar", bold()))
+        assertSpans(
+                expected = "<StyleSpan>bAR</StyleSpan> foo <StyleSpan>Bar</StyleSpan>",
+                actual = Spanner().append("bAR foo Bar").span("bar", ignoreCase = true, spans = bold())
         )
     }