diff --git a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java
index 71af2b38a..93c8882b9 100644
--- a/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java
+++ b/headless-services/concourse-language-server/src/main/java/org/springframework/ide/vscode/concourse/PipelineYmlSchema.java
@@ -426,7 +426,7 @@ public class PipelineYmlSchema implements YamlSchema {
 			addProp(get, "depth", t_pos_integer);
 			addProp(get, "submodules", f.yany("GitSubmodules").addHints("all", "none"));
 			addProp(get, "disable_git_lfs", t_boolean);
-			addProp(get, "fetch", t_strings); //Warning: t_strings is just a guess. This property is undocumented. The example I've seen seem to use list of git branch/tag names.
+			addProp(get, "fetch", t_strings).isDeprecated(true); //Warning: t_strings is just a guess. This property is undocumented. The example I've seen seem to use list of git branch/tag names.
 
 			AbstractType put = f.ybean("GitPutParams");
 			addProp(put, "repository", t_ne_string).isPrimary(true);
diff --git a/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java b/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java
index 173a7b37b..a29a31622 100644
--- a/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java
+++ b/headless-services/concourse-language-server/src/test/java/org/springframework/ide/vscode/concourse/ConcourseEditorTest.java
@@ -1162,11 +1162,11 @@ public class ConcourseEditorTest {
 				,
 				"disable_git_lfs: <*>"
 				,
-				"fetch:\n" +
-				"      - <*>"
-				,
 				"submodules:\n"+
 				"        <*>"
+				,
+				"fetch:\n" + // Deprecated, so not suggested
+				"      - <*>"
 		);
 		assertContextualCompletions(context,
 				"disable_git_lfs: <*>"
@@ -3911,7 +3911,8 @@ public class ConcourseEditorTest {
 				"      fetch: [master]\n" +
 				"      submodules: none\n"
 		);
-		editor.assertProblems(/*NONE*/);
+		Diagnostic p = editor.assertProblems("fetch|Deprecated").get(0);
+		assertEquals(DiagnosticSeverity.Warning, p.getSeverity());
 	}
 
 	@Test public void bug_150337510() throws Exception {