diff --git a/slstatus.c b/slstatus.c
index 8479bf1..49b14de 100644
--- a/slstatus.c
+++ b/slstatus.c
@@ -37,34 +37,34 @@ struct arg {
 	const char *args;
 };
 
-static char *smprintf(const char *, ...);
-static char *battery_perc(const char *);
-static char *battery_state(const char *);
+static char *smprintf(const char *fmt, ...);
+static char *battery_perc(const char *bat);
+static char *battery_state(const char *bat);
 static char *cpu_perc(void);
-static char *datetime(const char *);
-static char *disk_free(const char *);
-static char *disk_perc(const char *);
-static char *disk_total(const char *);
-static char *disk_used(const char *);
+static char *datetime(const char *fmt);
+static char *disk_free(const char *mnt);
+static char *disk_perc(const char *mnt);
+static char *disk_total(const char *mnt);
+static char *disk_used(const char *mnt);
 static char *entropy(void);
 static char *gid(void);
 static char *hostname(void);
-static char *ip(const char *);
+static char *ip(const char *iface);
 static char *load_avg(void);
 static char *ram_free(void);
 static char *ram_perc(void);
 static char *ram_used(void);
 static char *ram_total(void);
-static char *run_command(const char *);
-static char *temp(const char *);
+static char *run_command(const char *cmd);
+static char *temp(const char *file);
 static char *uid(void);
 static char *uptime(void);
 static char *username(void);
-static char *vol_perc(const char *);
-static char *wifi_perc(const char *);
-static char *wifi_essid(const char *);
-static void set_status(const char *);
-static void sighandler(const int);
+static char *vol_perc(const char *card);
+static char *wifi_perc(const char *iface);
+static char *wifi_essid(const char *iface);
+static void set_status(const char *str);
+static void sighandler(const int signo);
 static void usage(void);
 
 char *argv0;