diff --git a/CHANGELOG.md b/CHANGELOG.md
index d90d6c91..b4dcea9c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,7 @@
 * Improve: disable fsync during storage verification
 * Improve: suppress duplicate log lines on startup
 * Contrib: logwatch config and script
+* Improve: log precondition result on PUT request
 
 ## 3.3.2
 * Fix: debug logging in rights/from_file
diff --git a/radicale/app/put.py b/radicale/app/put.py
index c1f0eacd..6e1ba215 100644
--- a/radicale/app/put.py
+++ b/radicale/app/put.py
@@ -198,15 +198,22 @@ class ApplicationPartPut(ApplicationBase):
             etag = environ.get("HTTP_IF_MATCH", "")
             if not item and etag:
                 # Etag asked but no item found: item has been removed
+                logger.warning("Precondition failed on PUT request for %r (HTTP_IF_MATCH: %s, item not existing)", path, etag)
                 return httputils.PRECONDITION_FAILED
             if item and etag and item.etag != etag:
                 # Etag asked but item not matching: item has changed
+                logger.warning("Precondition failed on PUT request for %r (HTTP_IF_MATCH: %s, item has different etag: %s)", path, etag, item.etag)
                 return httputils.PRECONDITION_FAILED
+            if item and etag:
+                logger.debug("Precondition passed on PUT request for %r (HTTP_IF_MATCH: %s, item has etag: %s)", path, etag, item.etag)
 
             match = environ.get("HTTP_IF_NONE_MATCH", "") == "*"
             if item and match:
                 # Creation asked but item found: item can't be replaced
+                logger.warning("Precondition failed on PUT request for %r (HTTP_IF_NONE_MATCH: *, creation requested but item found with etag: %s)", path, item.etag)
                 return httputils.PRECONDITION_FAILED
+            if match:
+                logger.debug("Precondition passed on PUT request for %r (HTTP_IF_NONE_MATCH: *)", path)
 
             if (tag != prepared_tag or
                     prepared_write_whole_collection != write_whole_collection):