diff --git a/util/superiotool/README b/util/superiotool/README
index 24845b5185..cd7d566b21 100644
--- a/util/superiotool/README
+++ b/util/superiotool/README
@@ -30,10 +30,10 @@ Installation
 Usage
 -----
 
- $ superiotool [-d] [-l] [-V] [-v] [-h]
+ $ superiotool [-d] [-e] [-l] [-V] [-v] [-h]
 
  -d | --dump            Dump Super I/O register contents
- -e | --extra-dump      Dump Secondary registers too (like EC registers etc.)
+ -e | --extra-dump      Dump secondary registers too (e.g. EC registers)
  -l | --list-supported  Show the list of supported Super I/O chips
  -V | --verbose         Verbose mode
  -v | --version         Show the superiotool version
diff --git a/util/superiotool/ite.c b/util/superiotool/ite.c
index 9d3a263a57..784c4efcda 100644
--- a/util/superiotool/ite.c
+++ b/util/superiotool/ite.c
@@ -379,7 +379,7 @@ static void exit_conf_mode_ite(uint16_t port)
 
 static void probe_idregs_ite_helper(const char *init, uint16_t port)
 {
-	uint16_t id, chipver;
+	uint16_t id, chipver, ecport;
 
 	probing_for("ITE", init, port);
 
@@ -400,13 +400,16 @@ static void probe_idregs_ite_helper(const char *init, uint16_t port)
 	dump_superio("ITE", reg_table, port, id);
 
 	if (extra_dump) {
-		uint16_t ecport;
-		regwrite(port, 0x07, 0x04); /*EC LDN*/
+		regwrite(port, 0x07, 0x04); /* Select LDN 4 (EC). */
+
+		/* Get EC base address (stored in LDN 4, index 0x60/0x61). */
 		ecport = regval(port, 0x60) << 8;
 		ecport |= regval(port, 0x61);
+
+		/* EC address register = EC base address + 5. */
 		ecport += 5;
 
-		printf("Environment Controller (0x%04x)\n",ecport);
+		printf("Environment controller (0x%04x)\n", ecport);
 		dump_superio("ITE-EC", ec_table, ecport, id);
 	}
 }
diff --git a/util/superiotool/superiotool.8 b/util/superiotool/superiotool.8
index 65a302a1a6..35046d1809 100644
--- a/util/superiotool/superiotool.8
+++ b/util/superiotool/superiotool.8
@@ -77,8 +77,8 @@ detailed information about the
 Dump extra secondary register contents too, if available. Only in combination
 with the
 .B --dump
-option. This option will, for instance, dump the Environmental Controller
-configuration registers for the ITE IT8716f chip. The format is similar to
+option. This option will, for instance, dump the environmental controller (EC)
+configuration registers for the ITE IT8716F chip. The format is similar to
 the output of the
 .B --dump
 option.
diff --git a/util/superiotool/superiotool.c b/util/superiotool/superiotool.c
index 1edaf30f86..637c0b089e 100644
--- a/util/superiotool/superiotool.c
+++ b/util/superiotool/superiotool.c
@@ -158,8 +158,7 @@ void probing_for(const char *vendor, const char *info, uint16_t port)
 		return;
 
 	/* Yes, there's no space between '%s' and 'at'! */
-	printf("Probing for %s Super I/O %sat 0x%x...\n",
-	       vendor, info, port);
+	printf("Probing for %s Super I/O %sat 0x%x...\n", vendor, info, port);
 }
 
 /** Print a list of all supported chips from the given vendor. */
diff --git a/util/superiotool/superiotool.h b/util/superiotool/superiotool.h
index 2ee9019b4c..6961325388 100644
--- a/util/superiotool/superiotool.h
+++ b/util/superiotool/superiotool.h
@@ -30,9 +30,9 @@
 #include <getopt.h>
 #include <sys/io.h>
 
-#define USAGE "Usage: superiotool [-d] [-l] [-V] [-v] [-h]\n\n\
+#define USAGE "Usage: superiotool [-d] [-e] [-l] [-V] [-v] [-h]\n\n\
   -d | --dump            Dump Super I/O register contents\n\
-  -e | --extra-dump      Dump Secondary registers too (like EC registers etc.)\n\
+  -e | --extra-dump      Dump secondary registers too (e.g. EC registers)\n\
   -l | --list-supported  Show the list of supported Super I/O chips\n\
   -V | --verbose         Verbose mode\n\
   -v | --version         Show the superiotool version\n\