diff --git a/README.md b/README.md
index 0a8fb4b..ab501b0 100644
--- a/README.md
+++ b/README.md
@@ -101,7 +101,7 @@ Options:
 ```
 kdoctor -v
 Environment diagnose:
-[✓] Operation System
+[✓] Operating System
   ➤ Version OS: macOS 13.1
     CPU: Apple M1 Max
 
diff --git a/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/Doctor.kt b/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/Doctor.kt
index 8a1697c..a0545a2 100644
--- a/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/Doctor.kt
+++ b/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/Doctor.kt
@@ -97,7 +97,7 @@ class Doctor(private val system: System) {
             send("    Please check the output for problem description and possible solutions.\n")
         } else {
             val prefix = "  ${DiagnosisResult.Success.color}${DiagnosisResult.Success.symbol}${TextPainter.RESET} "
-            send("${prefix}Your operation system is ready for Kotlin Multiplatform Mobile Development!\n")
+            send("${prefix}Your operating system is ready for Kotlin Multiplatform Mobile Development!\n")
         }
     }.buffer(0).flowOn(Dispatchers.Default)
 
diff --git a/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnostic.kt b/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnostic.kt
index cbbe185..6efbf24 100644
--- a/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnostic.kt
+++ b/kdoctor/src/commonMain/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnostic.kt
@@ -3,7 +3,7 @@ package org.jetbrains.kotlin.doctor.diagnostics
 import org.jetbrains.kotlin.doctor.entity.*
 
 class SystemDiagnostic(private val system: System) : Diagnostic() {
-    override val title = "Operation System"
+    override val title = "Operating System"
 
     override fun diagnose(): Diagnosis {
         val result = Diagnosis.Builder(title)
diff --git a/kdoctor/src/jvmTest/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnosticTest.kt b/kdoctor/src/jvmTest/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnosticTest.kt
index c546367..7b103a4 100644
--- a/kdoctor/src/jvmTest/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnosticTest.kt
+++ b/kdoctor/src/jvmTest/kotlin/org/jetbrains/kotlin/doctor/diagnostics/SystemDiagnosticTest.kt
@@ -12,7 +12,7 @@ internal class SystemDiagnosticTest {
         val system = object : BaseTestSystem() {}
         val diagnose = SystemDiagnostic(system).diagnose()
 
-        val expected = Diagnosis.Builder("Operation System").apply {
+        val expected = Diagnosis.Builder("Operating System").apply {
             addSuccess(
                 "Version OS: macOS 42.777",
                 "CPU: test_cpu"
@@ -38,7 +38,7 @@ internal class SystemDiagnosticTest {
         }
         val diagnose = SystemDiagnostic(system).diagnose()
 
-        val expected = Diagnosis.Builder("Operation System").apply {
+        val expected = Diagnosis.Builder("Operating System").apply {
             addSuccess(
                 "Version OS: macOS 42.777",
                 "CPU: test_cpu"
@@ -63,7 +63,7 @@ internal class SystemDiagnosticTest {
         }
         val diagnose = SystemDiagnostic(system).diagnose()
 
-        val expected = Diagnosis.Builder("Operation System").apply {
+        val expected = Diagnosis.Builder("Operating System").apply {
             addFailure(
                 "OS: Linux 42.777"
             )
@@ -79,7 +79,7 @@ internal class SystemDiagnosticTest {
         }
         val diagnose = SystemDiagnostic(system).diagnose()
 
-        val expected = Diagnosis.Builder("Operation System").apply {
+        val expected = Diagnosis.Builder("Operating System").apply {
             addFailure(
                 "OS: macOS null"
             )