diff --git a/CHANGELOG.md b/CHANGELOG.md
index 451853b..51e9a5b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -25,6 +25,7 @@ ambiguous situations.
 ### Added
 - `credential-file` authenticator
 - `--credential-file` option for `kit-ilias-web` command
+- Warning if using concurrent tasks with `kit-ilias-web`
 
 ### Fixed
 - Date parsing now also works correctly in non-group exercises
diff --git a/PFERD/crawl/ilias/kit_ilias_web_crawler.py b/PFERD/crawl/ilias/kit_ilias_web_crawler.py
index fbbfc1b..78428e0 100644
--- a/PFERD/crawl/ilias/kit_ilias_web_crawler.py
+++ b/PFERD/crawl/ilias/kit_ilias_web_crawler.py
@@ -21,7 +21,6 @@ TargetType = Union[str, int]
 
 
 class KitIliasWebCrawlerSection(HttpCrawlerSection):
-
     def target(self) -> TargetType:
         target = self.s.get("target")
         if not target:
@@ -164,6 +163,12 @@ class KitIliasWebCrawler(HttpCrawler):
         auth = section.auth(authenticators)
         super().__init__(name, section, config, shared_auth=auth)
 
+        if section.tasks() > 1:
+            log.warn("""
+Please avoid using too many parallel requests as these are the KIT ILIAS
+instance's greatest bottleneck.
+            """.strip())
+
         self._shibboleth_login = KitShibbolethLogin(
             auth,
             section.tfa_auth(authenticators),