diff --git a/asciidoc-pmg.in b/asciidoc-pmg.in
index 532ea7f..fefca5e 100644
--- a/asciidoc-pmg.in
+++ b/asciidoc-pmg.in
@@ -79,7 +79,7 @@ sub pop_environment {
     die "unable to pop env '$env'" if !defined($last_stack_entry);
 
     my ($last_env, $skip) = @$last_stack_entry;
-    die "environment missmatch (${last_env} != $env)\n" if $last_env ne $env;
+    die "environment mismatch (${last_env} != $env)\n" if $last_env ne $env;
 
     if (!scalar(@$env_stack)) {
 	$env_skip = 0;
@@ -213,7 +213,7 @@ sub prepare_adoc_file {
 	chomp $line;
 	if ($line =~ m/^if(n?)def::(\S+)\[(.*)\]\s*$/) {
 	    my ($not, $env, $text) = ($1, $2, $3);
-	    die "unsuported ifdef usage - implement me" if $text;
+	    die "unsupported ifdef usage - implement me" if $text;
 
 	    my $skip = !exists($attributes->{$env}) ? 1 : 0;
 	    $skip = ($skip ? 0 : 1 ) if $not;
@@ -222,7 +222,7 @@ sub prepare_adoc_file {
 	    next;
 	} elsif ($line =~ m/^endif::(\S+)\[(.*)\]\s*$/) {
 	    my ($env, $text) = ($1, $2);
-	    die "unsuported ifdef usage - implement me" if $text;
+	    die "unsupported ifdef usage - implement me" if $text;
 	    pop_environment($env);
 	    next;
 	}
diff --git a/asciidoc/pmg-docs.css b/asciidoc/pmg-docs.css
index 47eeb79..756b10d 100644
--- a/asciidoc/pmg-docs.css
+++ b/asciidoc/pmg-docs.css
@@ -139,7 +139,7 @@ h6:hover > a.headerlink {
         color: var(--pdt-text);
     }
 
-    /* reduce the brigthness of images a bit and make it reversable
+    /* reduce the brightness of images a bit and make it reversable
      * through hovering over them.
      */
     .image > img {
@@ -194,7 +194,7 @@ h6:hover > a.headerlink {
         filter: invert(100%) hue-rotate(180deg) brightness(90%);
     }
 
-    /* fixes the black text on unorderd lists */
+    /* fixes the black text on unordered lists */
     ul > li > * {
         color: var(--pdt-text);
     }
diff --git a/scan-adoc-refs b/scan-adoc-refs
index e7767dc..e80b02e 100755
--- a/scan-adoc-refs
+++ b/scan-adoc-refs
@@ -70,7 +70,7 @@ sub pop_environment {
     pop @$env_stack;
     my $res = pop @$env_name_stack;
 
-    die "environment missmatch ($res != $env)\n" if $res ne $env;
+    die "environment mismatch ($res != $env)\n" if $res ne $env;
 }
 
 sub register_include {
@@ -146,12 +146,12 @@ sub scan_adoc_file {
     while (defined (my $line = <$fh>)) {
 	if ($line =~ m/^if(n?)def::(\S+)\[(.*)\]\s*$/) {
 	    my ($not, $env, $text) = ($1, $2, $3);
-	    die "unsuported ifdef usage - implement me" if $text;
+	    die "unsupported ifdef usage - implement me" if $text;
 	    push_environment($env, $not);
 	    next;
 	} elsif ($line =~ m/^endif::(\S+)\[(.*)\]\s*$/) {
 	    my ($env, $text) = ($1, $2);
-	    die "unsuported ifdef usage - implement me" if $text;
+	    die "unsupported ifdef usage - implement me" if $text;
 	    pop_environment($env);
 	    next;
 	} elsif ($line =~ m/^include::(\S+)\[.*\]\s*$/) {