diff --git a/contrib/pg_surgery/heap_surgery.c b/contrib/pg_surgery/heap_surgery.c
index 58641b8adf..37dffe3f7d 100644
--- a/contrib/pg_surgery/heap_surgery.c
+++ b/contrib/pg_surgery/heap_surgery.c
@@ -95,7 +95,7 @@ heap_force_common(FunctionCallInfo fcinfo, HeapTupleForceOption heap_force_opt)
 		ereport(ERROR,
 				(errcode(ERRCODE_OBJECT_NOT_IN_PREREQUISITE_STATE),
 				 errmsg("recovery is in progress"),
-				 errhint("heap surgery functions cannot be executed during recovery.")));
+				 errhint("Heap surgery functions cannot be executed during recovery.")));
 
 	/* Check inputs. */
 	sanity_check_tid_array(ta, &ntids);
diff --git a/src/backend/commands/event_trigger.c b/src/backend/commands/event_trigger.c
index b146d2aaf4..f193c7ddf6 100644
--- a/src/backend/commands/event_trigger.c
+++ b/src/backend/commands/event_trigger.c
@@ -174,7 +174,7 @@ CreateEventTrigger(CreateEventTrigStmt *stmt)
 	else if (strcmp(stmt->eventname, "login") == 0 && tags != NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
-				 errmsg("Tag filtering is not supported for login event trigger")));
+				 errmsg("tag filtering is not supported for login event trigger")));
 
 	/*
 	 * Give user a nice error message if an event trigger of the same name
diff --git a/src/backend/storage/file/fd.c b/src/backend/storage/file/fd.c
index 43d2b2a156..d298e4842c 100644
--- a/src/backend/storage/file/fd.c
+++ b/src/backend/storage/file/fd.c
@@ -3961,7 +3961,7 @@ check_debug_io_direct(char **newval, void **extra, GucSource source)
 
 	if (!SplitGUCList(rawstring, ',', &elemlist))
 	{
-		GUC_check_errdetail("invalid list syntax in parameter %s",
+		GUC_check_errdetail("Invalid list syntax in parameter %s",
 							"debug_io_direct");
 		pfree(rawstring);
 		list_free(elemlist);
@@ -3981,7 +3981,7 @@ check_debug_io_direct(char **newval, void **extra, GucSource source)
 			flags |= IO_DIRECT_WAL_INIT;
 		else
 		{
-			GUC_check_errdetail("invalid option \"%s\"", item);
+			GUC_check_errdetail("Invalid option \"%s\"", item);
 			result = false;
 			break;
 		}
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index 1eaaf3c6c5..1a34bd3715 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -2479,7 +2479,7 @@ errdetail_params(ParamListInfo params)
 
 		str = BuildParamLogString(params, NULL, log_parameter_max_length);
 		if (str && str[0] != '\0')
-			errdetail("parameters: %s", str);
+			errdetail("Parameters: %s", str);
 	}
 
 	return 0;
@@ -2494,7 +2494,7 @@ static int
 errdetail_abort(void)
 {
 	if (MyProc->recoveryConflictPending)
-		errdetail("abort reason: recovery conflict");
+		errdetail("Abort reason: recovery conflict");
 
 	return 0;
 }
diff --git a/src/backend/utils/error/elog.c b/src/backend/utils/error/elog.c
index 9ef7cfc193..2c7a20e3d3 100644
--- a/src/backend/utils/error/elog.c
+++ b/src/backend/utils/error/elog.c
@@ -2140,7 +2140,7 @@ check_backtrace_functions(char **newval, void **extra, GucSource source)
 					  ", \n\t");
 	if (validlen != newvallen)
 	{
-		GUC_check_errdetail("invalid character");
+		GUC_check_errdetail("Invalid character");
 		return false;
 	}
 
diff --git a/src/bin/pgbench/t/001_pgbench_with_server.pl b/src/bin/pgbench/t/001_pgbench_with_server.pl
index 977bc7cdcc..fc57facf9e 100644
--- a/src/bin/pgbench/t/001_pgbench_with_server.pl
+++ b/src/bin/pgbench/t/001_pgbench_with_server.pl
@@ -290,7 +290,7 @@ select column1::jsonb from (values (:value), (:long)) as q;
 my $log = PostgreSQL::Test::Utils::slurp_file($node->logfile);
 unlike(
 	$log,
-	qr[DETAIL:  parameters: \$1 = '\{ invalid ',],
+	qr[DETAIL:  Parameters: \$1 = '\{ invalid ',],
 	"no parameters logged");
 $log = undef;
 
@@ -331,7 +331,7 @@ select column1::jsonb from (values (:value), (:long)) as q;
 $log = PostgreSQL::Test::Utils::slurp_file($node->logfile);
 like(
 	$log,
-	qr[DETAIL:  parameters: \$1 = '\{ invalid ', \$2 = '''Valame Dios!'' dijo Sancho; ''no le dije yo a vuestra merced que mirase bien lo que hacia\?'''],
+	qr[DETAIL:  Parameters: \$1 = '\{ invalid ', \$2 = '''Valame Dios!'' dijo Sancho; ''no le dije yo a vuestra merced que mirase bien lo que hacia\?'''],
 	"parameter report does not truncate");
 $log = undef;
 
@@ -376,7 +376,7 @@ select column1::jsonb from (values (:value), (:long)) as q;
 $log = PostgreSQL::Test::Utils::slurp_file($node->logfile);
 like(
 	$log,
-	qr[DETAIL:  parameters: \$1 = '\{ inval\.\.\.', \$2 = '''Valame\.\.\.'],
+	qr[DETAIL:  Parameters: \$1 = '\{ inval\.\.\.', \$2 = '''Valame\.\.\.'],
 	"parameter report truncates");
 $log = undef;