diff --git a/dist/index.js b/dist/index.js
index ab82125..7ba0702 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -301,6 +301,10 @@ class DotnetCoreInstaller {
     }
     installDotnet() {
         return __awaiter(this, void 0, void 0, function* () {
+            const dotnetInstallDir = process.env['DOTNET_INSTALL_DIR'];
+            if (dotnetInstallDir) {
+                core.debug(`DOTNET_INSTALL_DIR is set up to ${dotnetInstallDir}`);
+            }
             const windowsDefaultOptions = [
                 '-NoLogo',
                 '-Sta',
diff --git a/src/installer.ts b/src/installer.ts
index dc3c275..ecae01d 100644
--- a/src/installer.ts
+++ b/src/installer.ts
@@ -170,6 +170,10 @@ export class DotnetCoreInstaller {
   }
 
   public async installDotnet(): Promise<string> {
+    const dotnetInstallDir = process.env['DOTNET_INSTALL_DIR'];
+    if (dotnetInstallDir) {
+      core.debug(`DOTNET_INSTALL_DIR is set up to ${dotnetInstallDir}`);
+    }
     const windowsDefaultOptions = [
       '-NoLogo',
       '-Sta',