diff --git a/Makefile b/Makefile
index e1af62626..518c3fa6b 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ BENCH_FLAGS ?= -cpuprofile=cpu.pprof -memprofile=mem.pprof -benchmem
 # Directories containing independent Go modules.
 #
 # We track coverage only for the main module.
-MODULE_DIRS = . ./benchmarks ./zapgrpc/internal/test
+MODULE_DIRS = . ./exp ./benchmarks ./zapgrpc/internal/test
 
 # Many Go tools take file globs or directories as arguments instead of packages.
 GO_FILES := $(shell \
diff --git a/exp/zapslog/slog.go b/exp/zapslog/slog.go
index bf055cc07..20de57b8d 100644
--- a/exp/zapslog/slog.go
+++ b/exp/zapslog/slog.go
@@ -100,7 +100,7 @@ func convertAttrToField(attr slog.Attr) zapcore.Field {
 	case slog.KindLogValuer:
 		return convertAttrToField(slog.Attr{
 			Key: attr.Key,
-			// FIXME(knight42): resolve the value in a lazy way
+			// TODO: resolve the value in a lazy way
 			Value: attr.Value.Resolve(),
 		})
 	default:
@@ -136,7 +136,7 @@ func (h *Handler) Handle(ctx context.Context, record slog.Record) error {
 		Time:       record.Time,
 		Message:    record.Message,
 		LoggerName: h.name,
-		// FIXME: do we need to set the following fields?
+		// TODO: do we need to set the following fields?
 		// Stack:
 	}
 	ce := h.core.Check(ent, nil)
@@ -146,7 +146,7 @@ func (h *Handler) Handle(ctx context.Context, record slog.Record) error {
 
 	if h.addSource {
 		frame, _ := runtime.CallersFrames([]uintptr{record.PC}).Next()
-		ce.Entry.Caller = zapcore.EntryCaller{
+		ce.Caller = zapcore.EntryCaller{
 			Defined:  true,
 			PC:       frame.PC,
 			File:     frame.File,
diff --git a/exp/zapslog/slog_test.go b/exp/zapslog/slog_test.go
index 2d87a72ca..2ef3a0d81 100644
--- a/exp/zapslog/slog_test.go
+++ b/exp/zapslog/slog_test.go
@@ -1,3 +1,23 @@
+// Copyright (c) 2023 Uber Technologies, Inc.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
 package zapslog
 
 import (