diff --git a/src/main/java/at/auerchri/github_auto_closer/GitHubAutoCloser.java b/src/main/java/at/auerchri/github_auto_closer/GitHubAutoCloser.java
index 6e0571f..7578a8c 100644
--- a/src/main/java/at/auerchri/github_auto_closer/GitHubAutoCloser.java
+++ b/src/main/java/at/auerchri/github_auto_closer/GitHubAutoCloser.java
@@ -21,6 +21,8 @@ class GitHubAutoCloser {
     private int mDaysWithInactivity;
     private Label mLabelToAdd;
 
+    private int warningBounds;
+
     private static final String CLOSE_MESSAGE = "Hey there!\n" +
             "\n" +
             "We're automatically closing this issue since there was no activity in this issue since %1$d days ago. We therefore assume that the user has lost interest or resolved the problem on their own. Closed issues that remain inactive for a long period may get automatically locked.\n" +
@@ -31,6 +33,16 @@ class GitHubAutoCloser {
             "\n" +
             "<sub>(Please note that this is an [automated](https://github.com/auchri/github_auto_closer) comment.)</sub>";
 
+    private static final String WARNING_MESSAGE = "Hey there!\n" +
+            "\n" +
+            "We've detected that this issue since has had no activity in %1$d days. We therefore assume that the user has lost interest or resolved the problem on their own. Closed issues that remain inactive for a long period may get automatically locked.\n" +
+            "\n" +
+            "Don't worry though; this is just a warning that the issue will be closed in %2$d days is there is no further activity on this issue.\n" +
+            "\n" +
+            "Thanks!\n" +
+            "\n" +
+            "<sub>(Please note that this is an [automated](https://github.com/auchri/github_auto_closer) comment.)</sub>";
+
     // Labels for issues which should not be closed
     private static final List<String> LABELS_KEEP = new ArrayList<>();
 
@@ -50,6 +62,8 @@ class GitHubAutoCloser {
         mIncludePullRequests = includePullRequests;
         mDaysWithInactivity = daysWithInactivity;
 
+        warningBounds = 30;
+
         if (labelToAdd != null) {
             mLabelToAdd = new Label().setName(labelToAdd);
         }
@@ -68,6 +82,8 @@ void run() {
         RepositoryId repositoryId = new RepositoryId(mNamespace, mRepository);
         List<Issue> issues = getIssues(issueService, repositoryId);
 
+        boolean wasError;
+
         if (issues == null) {
             return;
         }
@@ -87,10 +103,16 @@ void run() {
                     continue;
                 }
 
-                boolean wasError = closeIssue(issueService, repositoryId, issue, daysWithoutActivity);
-
-                if (wasError) {
-                    break;
+                if (daysWithoutActivity < warningBounds) {
+                    wasError = warnIssue(issueService, repositoryId, issue, daysWithoutActivity);
+                    if (wasError) {
+                        break;
+                    }
+                } else {
+                    wasError = closeIssue(issueService, repositoryId, issue, daysWithoutActivity);
+                    if (wasError) {
+                        break;
+                    }
                 }
 
                 nClosedIssues++;
@@ -143,6 +165,36 @@ private boolean issueHasLabels(Issue issue) {
         return false;
     }
 
+
+    /**
+     * Posts a warning to an issue
+     *
+     * @param issueService        The issue service
+     * @param repositoryId        The repository of the issue
+     * @param issue               The issue which is given a warning
+     * @param daysWithoutActivity Amount of days without activity
+     * @return True if there was an error
+     */
+    private boolean warnIssue(IssueService issueService, RepositoryId repositoryId, Issue issue, long daysWithoutActivity) {
+        String message = String.format(WARNING_MESSAGE, daysWithoutActivity, 30-daysWithoutActivity);
+
+        if (mLabelToAdd != null) {
+            issue.getLabels().add(mLabelToAdd);
+        }
+
+        try {
+            issueService.createComment(repositoryId, issue.getNumber(), message);
+            issueService.editIssue(repositoryId, issue);
+
+            Logger.log(Logger.Level.INFO, "Gave warning to issue %1$d (%2$s)", issue.getNumber(), issue.getTitle());
+        } catch (Exception e) {
+            Logger.log(Logger.Level.ERROR, e, "Error giving warning to issue %1$d", issue.getNumber());
+            return true;
+        }
+
+        return false;
+    }
+
     /**
      * Closes an issue
      *