diff --git a/errclass/errclass.go b/errclass/errclass.go
index fe46190..4e3b9d9 100644
--- a/errclass/errclass.go
+++ b/errclass/errclass.go
@@ -10,7 +10,7 @@ with names resembling standard Unix error names.
 
 1. Preserve original error in `err` in the structured logs.
 
-2. Add the classified error as the `errclass` field.
+2. Add the classified error as the `errClass` field.
 
 3. Use [errors.Is] and [errors.As] for classification.
 
diff --git a/netcore/conn.go b/netcore/conn.go
index 27e4570..b14e0f6 100644
--- a/netcore/conn.go
+++ b/netcore/conn.go
@@ -96,7 +96,7 @@ func (c *connWrapper) Close() (err error) {
 			c.ctx,
 			"closeDone",
 			slog.Any("err", err),
-			slog.String("errclass", errclass.New(err)),
+			slog.String("errClass", errclass.New(err)),
 			slog.String("localAddr", c.laddr),
 			slog.String("protocol", c.protocol),
 			slog.String("remoteAddr", c.raddr),
@@ -132,7 +132,7 @@ func (c *connWrapper) Read(buf []byte) (int, error) {
 		"readDone",
 		slog.Int("ioBytesCount", count),
 		slog.Any("err", err),
-		slog.String("errclass", errclass.New(err)),
+		slog.String("errClass", errclass.New(err)),
 		slog.String("localAddr", c.laddr),
 		slog.String("protocol", c.protocol),
 		slog.String("remoteAddr", c.raddr),
@@ -183,7 +183,7 @@ func (c *connWrapper) Write(data []byte) (n int, err error) {
 		"writeDone",
 		slog.Int("ioBytesCount", count),
 		slog.Any("err", err),
-		slog.String("errclass", errclass.New(err)),
+		slog.String("errClass", errclass.New(err)),
 		slog.String("localAddr", c.laddr),
 		slog.String("protocol", c.protocol),
 		slog.String("remoteAddr", c.raddr),
diff --git a/netcore/dialer.go b/netcore/dialer.go
index b41258c..292a573 100644
--- a/netcore/dialer.go
+++ b/netcore/dialer.go
@@ -109,7 +109,7 @@ func (nx *Network) emitConnectDone(ctx context.Context,
 			ctx,
 			"connectDone",
 			slog.Any("err", err),
-			slog.String("errclass", errclass.New(err)),
+			slog.String("errClass", errclass.New(err)),
 			slog.String("localAddr", connLocalAddr(conn).String()),
 			slog.String("protocol", network),
 			slog.String("remoteAddr", address),
diff --git a/netcore/resolver.go b/netcore/resolver.go
index fca1043..a3f7c3e 100644
--- a/netcore/resolver.go
+++ b/netcore/resolver.go
@@ -97,7 +97,7 @@ func (nx *Network) emitLookupHostDone(ctx context.Context,
 			slog.String("dnsLookupDomain", domain),
 			slog.Any("dnsResolvedAddrs", addrs),
 			slog.Any("err", err),
-			slog.String("errclass", errclass.New(err)),
+			slog.String("errClass", errclass.New(err)),
 			slog.Time("t0", t0),
 			slog.Time("t", nx.timeNow()),
 		)
diff --git a/netcore/tlsdialer.go b/netcore/tlsdialer.go
index 0610d2b..048530c 100644
--- a/netcore/tlsdialer.go
+++ b/netcore/tlsdialer.go
@@ -117,7 +117,7 @@ func (td *tlsDialer) emitTLSHandshakeDone(ctx context.Context,
 			ctx,
 			"tlsHandshakeDone",
 			slog.Any("err", err),
-			slog.String("errclass", errclass.New(err)),
+			slog.String("errClass", errclass.New(err)),
 			slog.String("localAddr", localAddr),
 			slog.String("protocol", network),
 			slog.String("remoteAddr", remoteAddr),