diff --git a/tutorials/java/CurrentPlaceDetailsOnMap/app/build.gradle.kts b/tutorials/java/CurrentPlaceDetailsOnMap/app/build.gradle.kts
index b998621cc..b8fe20cfd 100644
--- a/tutorials/java/CurrentPlaceDetailsOnMap/app/build.gradle.kts
+++ b/tutorials/java/CurrentPlaceDetailsOnMap/app/build.gradle.kts
@@ -57,6 +57,13 @@ dependencies {
 }
 
 secrets {
+    // To add your Maps API key to this project:
+    // 1. If the secrets.properties file does not exist, create it in the same folder as the local.properties file.
+    // 2. Add this line, where YOUR_API_KEY is your API key:
+    //        MAPS_API_KEY=YOUR_API_KEY
     propertiesFileName = "secrets.properties"
+
+    // A properties file containing default secret values. This file can be
+    // checked in version control.
     defaultPropertiesFileName = "local.defaults.properties"
 }
diff --git a/tutorials/java/CurrentPlaceDetailsOnMap/local.defaults.properties b/tutorials/java/CurrentPlaceDetailsOnMap/local.defaults.properties
index 316c095d2..d0782b727 100644
--- a/tutorials/java/CurrentPlaceDetailsOnMap/local.defaults.properties
+++ b/tutorials/java/CurrentPlaceDetailsOnMap/local.defaults.properties
@@ -1,2 +1,2 @@
 MAPS_API_KEY=DEFAULT_API_KEY
-PLACES_API_KEY=YOUR_API_KEY
+PLACES_API_KEY=DEFAULT_API_KEY
diff --git a/tutorials/java/MapWithMarker/app/build.gradle.kts b/tutorials/java/MapWithMarker/app/build.gradle.kts
index 7625efe65..cceb4b9e4 100644
--- a/tutorials/java/MapWithMarker/app/build.gradle.kts
+++ b/tutorials/java/MapWithMarker/app/build.gradle.kts
@@ -55,5 +55,13 @@ dependencies {
 }
 
 secrets {
+    // To add your Maps API key to this project:
+    // 1. If the secrets.properties file does not exist, create it in the same folder as the local.properties file.
+    // 2. Add this line, where YOUR_API_KEY is your API key:
+    //        MAPS_API_KEY=YOUR_API_KEY
+    propertiesFileName = "secrets.properties"
+
+    // A properties file containing default secret values. This file can be
+    // checked in version control.
     defaultPropertiesFileName = "local.defaults.properties"
 }
diff --git a/tutorials/java/Polygons/app/build.gradle.kts b/tutorials/java/Polygons/app/build.gradle.kts
index d34aaaddd..38b925027 100644
--- a/tutorials/java/Polygons/app/build.gradle.kts
+++ b/tutorials/java/Polygons/app/build.gradle.kts
@@ -55,5 +55,13 @@ dependencies {
 }
 
 secrets {
+    // To add your Maps API key to this project:
+    // 1. If the secrets.properties file does not exist, create it in the same folder as the local.properties file.
+    // 2. Add this line, where YOUR_API_KEY is your API key:
+    //        MAPS_API_KEY=YOUR_API_KEY
+    propertiesFileName = "secrets.properties"
+
+    // A properties file containing default secret values. This file can be
+    // checked in version control.
     defaultPropertiesFileName = "local.defaults.properties"
 }
diff --git a/tutorials/java/StyledMap/app/build.gradle.kts b/tutorials/java/StyledMap/app/build.gradle.kts
index 4a53b2b73..37e621e2f 100644
--- a/tutorials/java/StyledMap/app/build.gradle.kts
+++ b/tutorials/java/StyledMap/app/build.gradle.kts
@@ -60,6 +60,13 @@ dependencies {
 }
 
 secrets {
+    // To add your Maps API key to this project:
+    // 1. If the secrets.properties file does not exist, create it in the same folder as the local.properties file.
+    // 2. Add this line, where YOUR_API_KEY is your API key:
+    //        MAPS_API_KEY=YOUR_API_KEY
     propertiesFileName = "secrets.properties"
+
+    // A properties file containing default secret values. This file can be
+    // checked in version control.
     defaultPropertiesFileName = "local.defaults.properties"
 }
diff --git a/tutorials/kotlin/CurrentPlaceDetailsOnMap/app/build.gradle.kts b/tutorials/kotlin/CurrentPlaceDetailsOnMap/app/build.gradle.kts
index cd2ff02f1..b7722def3 100644
--- a/tutorials/kotlin/CurrentPlaceDetailsOnMap/app/build.gradle.kts
+++ b/tutorials/kotlin/CurrentPlaceDetailsOnMap/app/build.gradle.kts
@@ -69,6 +69,13 @@ dependencies {
 }
 
 secrets {
+    // To add your Maps API key to this project:
+    // 1. If the secrets.properties file does not exist, create it in the same folder as the local.properties file.
+    // 2. Add this line, where YOUR_API_KEY is your API key:
+    //        MAPS_API_KEY=YOUR_API_KEY
     propertiesFileName = "secrets.properties"
+
+    // A properties file containing default secret values. This file can be
+    // checked in version control.
     defaultPropertiesFileName = "local.defaults.properties"
 }
diff --git a/tutorials/kotlin/MapWithMarker/app/build.gradle.kts b/tutorials/kotlin/MapWithMarker/app/build.gradle.kts
index 5cb141688..6a66a607f 100644
--- a/tutorials/kotlin/MapWithMarker/app/build.gradle.kts
+++ b/tutorials/kotlin/MapWithMarker/app/build.gradle.kts
@@ -64,6 +64,13 @@ dependencies {
 }
 
 secrets {
+    // To add your Maps API key to this project:
+    // 1. If the secrets.properties file does not exist, create it in the same folder as the local.properties file.
+    // 2. Add this line, where YOUR_API_KEY is your API key:
+    //        MAPS_API_KEY=YOUR_API_KEY
     propertiesFileName = "secrets.properties"
+
+    // A properties file containing default secret values. This file can be
+    // checked in version control.
     defaultPropertiesFileName = "local.defaults.properties"
 }
\ No newline at end of file
diff --git a/tutorials/kotlin/Polygons/app/build.gradle.kts b/tutorials/kotlin/Polygons/app/build.gradle.kts
index 2e55af33e..3e8b70b17 100644
--- a/tutorials/kotlin/Polygons/app/build.gradle.kts
+++ b/tutorials/kotlin/Polygons/app/build.gradle.kts
@@ -64,6 +64,13 @@ dependencies {
 }
 
 secrets {
+    // To add your Maps API key to this project:
+    // 1. If the secrets.properties file does not exist, create it in the same folder as the local.properties file.
+    // 2. Add this line, where YOUR_API_KEY is your API key:
+    //        MAPS_API_KEY=YOUR_API_KEY
     propertiesFileName = "secrets.properties"
+
+    // A properties file containing default secret values. This file can be
+    // checked in version control.
     defaultPropertiesFileName = "local.defaults.properties"
 }