diff --git a/src/python/bot/fuzzers/afl/launcher.py b/src/python/bot/fuzzers/afl/launcher.py
index 1792b8aadd..d657489ca6 100755
--- a/src/python/bot/fuzzers/afl/launcher.py
+++ b/src/python/bot/fuzzers/afl/launcher.py
@@ -1055,14 +1055,18 @@ def get_file_features(self, input_file_path, showmap_args):
     if not os.path.exists(self.showmap_output_path):
       if not self.showmap_no_output_logged:
         self.showmap_no_output_logged = True
-        logs.log_error(
-            ('afl-showmap didn\'t output any coverage. Command: {0}\n'
-             'Return code: {1}\n'
-             'Time executed: {2}\n'
-             'Output: {3}').format(
-                 showmap_result.command, showmap_result.return_code,
-                 showmap_result.time_executed, showmap_result.output))
-
+        logs.log_error(('afl-showmap didn\'t output any coverage for '
+                        'file {file_path} ({file_size} bytes).\n'
+                        'Command: {command}\n'
+                        'Return code: {return_code}\n'
+                        'Time executed: {time_executed}\n'
+                        'Output: {output}').format(
+                            file_path=input_file_path,
+                            file_size=os.path.getsize(input_file_path),
+                            command=showmap_result.command,
+                            return_code=showmap_result.return_code,
+                            time_executed=showmap_result.time_executed,
+                            output=showmap_result.output))
       return None, True
 
     showmap_output = engine_common.read_data_from_file(self.showmap_output_path)
@@ -1071,6 +1075,9 @@ def get_file_features(self, input_file_path, showmap_args):
     for match in re.finditer(self.SHOWMAP_REGEX, showmap_output):
       d = match.groupdict()
       features.add((int(d['guard']), int(d['hit_count'])))
+    logs.log('afl-showmap succeedded for '
+             'file {file_path}: {features} features'.format(
+                 file_path=input_file_path, features=len(features)))
     return frozenset(features), False
 
   def merge_corpus(self):