diff --git a/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt b/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt
index c977c7c2aee..b9e4ac13aee 100644
--- a/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt
+++ b/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/gradle/plugin/diagnostics/KotlinToolingDiagnostics.kt
@@ -349,7 +349,7 @@ object KotlinToolingDiagnostics {
 
         private fun renderSourceSetGroups(sourceSetGroups: Map<String, List<String>>) = buildString {
             for ((sourceSetTreeName, sourceSets) in sourceSetGroups) {
-                appendLine("Source Sets from '$sourceSetTreeName' Tree")
+                appendLine("Source Sets from '$sourceSetTreeName' Tree:")
                 appendLine(sourceSets.joinToString("\n") { "  * '$it'" })
             }
         }