diff --git a/cmdline.cc b/cmdline.cc
index 51b439b..5f97cbc 100644
--- a/cmdline.cc
+++ b/cmdline.cc
@@ -342,11 +342,10 @@ uint64_t parseRLimit(int res, const char *optarg, unsigned long mul) {
 		return cur.rlim_max;
 	}
 	if (!util::isANumber(optarg)) {
-		LOG_F("RLIMIT %d needs a numeric or 'max'/'hard'/'def'/'soft'/'inf' "
-		      "value "
-		      "('%s' "
-		      "provided)",
-		    res, optarg);
+		LOG_F(
+		    "RLIMIT %s (%d) needs a numeric value or 'max'/'hard'/'def'/'soft'/'inf' value "
+		    "(%s provided)",
+		    util::rLimName(res).c_str(), res, QC(optarg));
 	}
 	errno = 0;
 	uint64_t val = strtoull(optarg, NULL, 0);
diff --git a/subproc.cc b/subproc.cc
index 3ef143f..95923c8 100644
--- a/subproc.cc
+++ b/subproc.cc
@@ -230,7 +230,7 @@ static void newProc(nsjconf_t* nsjconf, int netfd, int fd_in, int fd_out, int fd
 		execv(nsjconf->exec_file.c_str(), (char* const*)argv.data());
 	}
 
-	PLOG_E("execve('%s') failed", nsjconf->exec_file.c_str());
+	PLOG_E("execve(%s) failed", QC(nsjconf->exec_file));
 }
 
 static void addProc(nsjconf_t* nsjconf, pid_t pid, int sock) {
diff --git a/util.cc b/util.cc
index 7f9d1fc..b882d69 100644
--- a/util.cc
+++ b/util.cc
@@ -313,6 +313,44 @@ const std::string sigName(int signo) {
 	return res;
 }
 
+const std::string rLimName(int res) {
+	std::string ret;
+
+	struct {
+		const int res;
+		const char* const name;
+	} static const rLimNames[] = {
+	    NS_VALSTR_STRUCT(RLIMIT_CPU),
+	    NS_VALSTR_STRUCT(RLIMIT_FSIZE),
+	    NS_VALSTR_STRUCT(RLIMIT_DATA),
+	    NS_VALSTR_STRUCT(RLIMIT_STACK),
+	    NS_VALSTR_STRUCT(RLIMIT_CORE),
+	    NS_VALSTR_STRUCT(RLIMIT_RSS),
+	    NS_VALSTR_STRUCT(RLIMIT_NOFILE),
+	    NS_VALSTR_STRUCT(RLIMIT_AS),
+	    NS_VALSTR_STRUCT(RLIMIT_NPROC),
+	    NS_VALSTR_STRUCT(RLIMIT_MEMLOCK),
+	    NS_VALSTR_STRUCT(RLIMIT_LOCKS),
+	    NS_VALSTR_STRUCT(RLIMIT_SIGPENDING),
+	    NS_VALSTR_STRUCT(RLIMIT_MSGQUEUE),
+	    NS_VALSTR_STRUCT(RLIMIT_NICE),
+	    NS_VALSTR_STRUCT(RLIMIT_RTPRIO),
+	    NS_VALSTR_STRUCT(RLIMIT_RTTIME),
+	};
+
+	for (const auto& i : rLimNames) {
+		if (res == i.res) {
+			ret.append(i.name);
+			return ret;
+		}
+	}
+
+	ret.append("RLIMITUNKNOWN(");
+	ret.append(std::to_string(res));
+	ret.append(")");
+	return ret;
+}
+
 const std::string timeToStr(time_t t) {
 	char timestr[128];
 	struct tm utctime;
diff --git a/util.h b/util.h
index d2ebd16..b1de1d7 100644
--- a/util.h
+++ b/util.h
@@ -65,6 +65,7 @@ const std::string StrQuote(const std::string& str);
 bool isANumber(const char* s);
 uint64_t rnd64(void);
 const std::string sigName(int signo);
+const std::string rLimName(int res);
 const std::string timeToStr(time_t t);
 std::vector<std::string> strSplit(const std::string str, char delim);
 long syscall(long sysno, uintptr_t a0 = 0, uintptr_t a1 = 0, uintptr_t a2 = 0, uintptr_t a3 = 0,