diff --git a/ivtest/gold/sdf_header-iverilog-stderr.gold b/ivtest/gold/sdf_header-iverilog-stderr.gold
new file mode 100644
index 000000000..e69de29bb
diff --git a/ivtest/gold/sdf_header-iverilog-stdout.gold b/ivtest/gold/sdf_header-iverilog-stdout.gold
new file mode 100644
index 000000000..e69de29bb
diff --git a/ivtest/gold/sdf_header-vvp-stderr.gold b/ivtest/gold/sdf_header-vvp-stderr.gold
new file mode 100644
index 000000000..e69de29bb
diff --git a/ivtest/gold/sdf_header-vvp-stdout.gold b/ivtest/gold/sdf_header-vvp-stdout.gold
new file mode 100644
index 000000000..0b6de0b8e
--- /dev/null
+++ b/ivtest/gold/sdf_header-vvp-stdout.gold
@@ -0,0 +1,11 @@
+ivltests/sdf_header.sdf:2:SDF INFO: Version: 3.0
+ivltests/sdf_header.sdf:3:SDF INFO: Design: test
+ivltests/sdf_header.sdf:4:SDF INFO: Date: Wed Mar 8 12:34:56 2023
+ivltests/sdf_header.sdf:5:SDF INFO: Vendor: No Vendor
+ivltests/sdf_header.sdf:6:SDF INFO: Program: Human
+ivltests/sdf_header.sdf:7:SDF INFO: Program Version: 1.0.0
+ivltests/sdf_header.sdf:8:SDF INFO: Divider: "/"
+ivltests/sdf_header.sdf:9:SDF INFO: Voltage: 5.000000
+ivltests/sdf_header.sdf:10:SDF INFO: Process: best=0.65:nom=1.0:worst=1.8
+ivltests/sdf_header.sdf:11:SDF INFO: Temperature: 25.000000
+ivltests/sdf_header.sdf:12:SDF INFO: Timescale: 1ps
diff --git a/ivtest/ivltests/sdf_header.sdf b/ivtest/ivltests/sdf_header.sdf
new file mode 100644
index 000000000..bbde907af
--- /dev/null
+++ b/ivtest/ivltests/sdf_header.sdf
@@ -0,0 +1,19 @@
+(DELAYFILE
+  (SDFVERSION "3.0")
+  (DESIGN "test")
+  (DATE "Wed Mar 8 12:34:56 2023")
+  (VENDOR "No Vendor")
+  (PROGRAM "Human")
+  (VERSION "1.0.0")
+  (DIVIDER /)
+  (VOLTAGE 5.5:5.0:4.5)
+  (PROCESS "best=0.65:nom=1.0:worst=1.8")
+  (TEMPERATURE -25.0:25.0:85.0)
+  (TIMESCALE 1 ps)
+  
+  // Do nothing
+  (CELL
+        (CELLTYPE "top")
+        (INSTANCE )
+  )
+)
diff --git a/ivtest/ivltests/sdf_header.v b/ivtest/ivltests/sdf_header.v
new file mode 100644
index 000000000..84e4745f4
--- /dev/null
+++ b/ivtest/ivltests/sdf_header.v
@@ -0,0 +1,10 @@
+`timescale 1ns/1ps
+
+module top;
+
+  initial begin
+    $sdf_annotate("ivltests/sdf_header.sdf", top);
+  end
+
+endmodule
+
diff --git a/ivtest/regress-vvp.list b/ivtest/regress-vvp.list
index b1cc5750d..2dd09bb7a 100644
--- a/ivtest/regress-vvp.list
+++ b/ivtest/regress-vvp.list
@@ -35,3 +35,4 @@ struct_packed_write_read	vvp_tests/struct_packed_write_read.json
 struct_packed_write_read2	vvp_tests/struct_packed_write_read2.json
 sv_foreach9			vvp_tests/sv_foreach9.json
 sv_foreach10			vvp_tests/sv_foreach10.json
+sdf_header			vvp_tests/sdf_header.json
diff --git a/ivtest/vvp_tests/sdf_header.json b/ivtest/vvp_tests/sdf_header.json
new file mode 100644
index 000000000..0a0698951
--- /dev/null
+++ b/ivtest/vvp_tests/sdf_header.json
@@ -0,0 +1,7 @@
+{
+    "type"   : "normal",
+    "source" : "sdf_header.v",
+    "gold"   : "sdf_header",
+    "iverilog-args" : [ "-gspecify" ],
+    "vvp-args-extended" : [ "-sdf-verbose" ]
+}
diff --git a/vpi/sdf_parse.y b/vpi/sdf_parse.y
index c735a06c6..50d4935d2 100644
--- a/vpi/sdf_parse.y
+++ b/vpi/sdf_parse.y
@@ -108,8 +108,10 @@ sdf_header_item
 
 sdfversion
   : '(' K_SDFVERSION QSTRING ')'
-    { free($3);
-    }
+      { if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Version: %s\n",
+					sdf_parse_path, @2.first_line, $3);
+        free($3);
+      }
   ;
 
 design_name
@@ -153,14 +155,33 @@ program_version
   ;
 
 hierarchy_divider
-  : '(' K_DIVIDER '.' ')' { sdf_use_hchar = '.'; }
-  | '(' K_DIVIDER '/' ')' { sdf_use_hchar = '/'; }
-  | '(' K_DIVIDER HCHAR ')' { /* sdf_use_hchar no-change */; }
+  : '(' K_DIVIDER '.' ')'
+      { sdf_use_hchar = '.';
+					if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Divider: \"%c\"\n", sdf_parse_path, @1.first_line, sdf_use_hchar);
+      }
+  | '(' K_DIVIDER '/' ')'
+      { sdf_use_hchar = '/';
+					if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Divider: \"%c\"\n", sdf_parse_path, @1.first_line, sdf_use_hchar);
+      }
+  | '(' K_DIVIDER HCHAR ')'
+      { /* sdf_use_hchar no-change */
+					if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Divider: \"%c\"\n", sdf_parse_path, @1.first_line, sdf_use_hchar);
+      }
   ;
 
 voltage
   : '(' K_VOLTAGE rtriple ')'
+      { /* The value must be defined. */
+      if (! $3.defined) {
+					vpi_printf("%s:%d: SDF ERROR: Chosen value not defined.\n", sdf_parse_path, @1.first_line);
+      }
+      else if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Voltage: %f\n",
+					sdf_parse_path, @2.first_line, $3.value);
+      }
   | '(' K_VOLTAGE signed_real_number ')'
+      { if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Voltage: %f\n",
+					sdf_parse_path, @2.first_line, $3);
+      }
   ;
 
 process
@@ -173,17 +194,27 @@ process
 
 temperature
   : '(' K_TEMPERATURE rtriple ')'
+      { /* The value must be defined. */
+      if (! $3.defined) {
+					vpi_printf("%s:%d: SDF ERROR: Chosen value not defined.\n", sdf_parse_path, @1.first_line);
+      }
+      else if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Temperature: %f\n",
+					sdf_parse_path, @2.first_line, $3.value);
+      }
   | '(' K_TEMPERATURE signed_real_number ')'
+      { if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Temperature: %f\n",
+					sdf_parse_path, @2.first_line, $3);
+      }
   ;
 
 time_scale
   : '(' K_TIMESCALE REAL_NUMBER IDENTIFIER ')'
-      { if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: TIMESCALE : %f%s\n",
+      { if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Timescale: %f%s\n",
 					sdf_parse_path, @2.first_line, $3, $4);
 	free($4);
       }
   | '(' K_TIMESCALE INTEGER IDENTIFIER ')'
-      { if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: TIMESCALE : %lu%s\n",
+      { if (sdf_flag_inform) vpi_printf("%s:%d:SDF INFO: Timescale: %lu%s\n",
 					sdf_parse_path, @2.first_line, $3, $4);
 	free($4);
       }