diff --git a/log.go b/log.go
index 6bbacbd..7408f7e 100644
--- a/log.go
+++ b/log.go
@@ -16,14 +16,14 @@ const (
 )
 
 // CategoryLog is the log flag category.
-var CategoryLog = "Logging"
+const CategoryLog = "Logging"
 
 // LogFlags are flags that configure logging.
 var LogFlags = Flags{
 	&cli.StringFlag{
 		Name:     FlagLogFormat,
 		Category: CategoryLog,
-		Usage:    "Specify the format of logs. Supported formats: 'logfmt', 'json', 'console'",
+		Usage:    "Specify the format of logs. Supported formats: 'logfmt', 'json', 'console'.",
 		EnvVars:  []string{"LOG_FORMAT"},
 	},
 	&cli.StringFlag{
diff --git a/profile.go b/profile.go
index 2dde134..e59f1cb 100644
--- a/profile.go
+++ b/profile.go
@@ -33,14 +33,14 @@ const (
 )
 
 // CategoryProfiling is the profiling category.
-var CategoryProfiling = "Profiling"
+const CategoryProfiling = "Profiling"
 
 // ProfilingFlags are flags that configure profiling.
 var ProfilingFlags = Flags{
 	&cli.StringFlag{
 		Name:     FlagProfilingDSN,
 		Category: CategoryProfiling,
-		Usage: "The address to the Pyroscope server, in the format " +
+		Usage: "The address to the Pyroscope server, in the format: " +
 			"'http://basic:auth@server:port?token=auth-token&tenantid=tenant-id'.",
 		EnvVars: []string{"PROFILING_DSN"},
 	},
diff --git a/stats.go b/stats.go
index 82192ad..d89b04f 100644
--- a/stats.go
+++ b/stats.go
@@ -27,7 +27,7 @@ const (
 )
 
 // CategoryStats is the stats flag category.
-var CategoryStats = "Stats"
+const CategoryStats = "Stats"
 
 // StatsFlags are flags that configure stats.
 var StatsFlags = Flags{
diff --git a/trace.go b/trace.go
index 9e07723..93935c0 100644
--- a/trace.go
+++ b/trace.go
@@ -27,7 +27,7 @@ const (
 )
 
 // CategoryTracing is the tracing flag category.
-var CategoryTracing = "Tracing"
+const CategoryTracing = "Tracing"
 
 // TracingFlags are flags that configure tracing.
 var TracingFlags = Flags{