diff --git a/lib/lrama/option_parser.rb b/lib/lrama/option_parser.rb
index fc245f76..c0c3f813 100644
--- a/lib/lrama/option_parser.rb
+++ b/lib/lrama/option_parser.rb
@@ -65,11 +65,19 @@ def parse_by_option_parser(argv)
         o.separator 'Output:'
         o.on('-H', '--header=[FILE]', 'also produce a header file named FILE') {|v| @options.header = true; @options.header_file = v }
         o.on('-d', 'also produce a header file') { @options.header = true }
-        o.on('-r', '--report=THINGS', Array, 'also produce details on the automaton') {|v| @report = v }
+        o.on('-r', '--report=REPORTS', Array, 'also produce details on the automaton') {|v| @report = v }
         o.on_tail ''
-        o.on_tail 'Valid Reports:'
-        o.on_tail "    #{VALID_REPORTS.join(' ')}"
-
+        o.on_tail 'REPORTS is a list of comma-separated words that can include:'
+        o.on_tail '    states                           describe the states'
+        o.on_tail '    itemsets                         complete the core item sets with their closure'
+        o.on_tail '    lookaheads                       explicitly associate lookahead tokens to items'
+        o.on_tail '    solved                           describe shift/reduce conflicts solving'
+        o.on_tail '    counterexamples, cex             generate conflict counterexamples'
+        o.on_tail '    rules                            list unused rules'
+        o.on_tail '    terms                            list unused terminals'
+        o.on_tail '    verbose                          report detailed internal state and analysis results'
+        o.on_tail '    all                              include all the above reports'
+        o.on_tail '    none                             disable all reports'
         o.on('--report-file=FILE', 'also produce details on the automaton output to a file named FILE') {|v| @options.report_file = v }
         o.on('-o', '--output=FILE', 'leave output to FILE') {|v| @options.outfile = v }
 
@@ -91,34 +99,34 @@ def parse_by_option_parser(argv)
       end
     end
 
-    BISON_REPORTS = %w[states itemsets lookaheads solved counterexamples cex all none]
-    OTHER_REPORTS = %w[rules terms verbose]
-    NOT_SUPPORTED_REPORTS = %w[cex none]
-    VALID_REPORTS = BISON_REPORTS + OTHER_REPORTS - NOT_SUPPORTED_REPORTS
+    ALIASED_REPORTS = { cex: :counterexamples }
+    VALID_REPORTS = %i[states itemsets lookaheads solved counterexamples rules terms verbose]
 
     def validate_report(report)
-      list = VALID_REPORTS
       h = { grammar: true }
+      return h if report.empty?
+      return {} if report == ['none']
+      if report == ['all']
+        VALID_REPORTS.each { |r| h[r] = true }
+        return h
+      end
 
       report.each do |r|
-        if list.include?(r)
-          h[r.to_sym] = true
+        aliased = aliased_report_option(r)
+        if VALID_REPORTS.include?(aliased)
+          h[aliased] = true
         else
           raise "Invalid report option \"#{r}\"."
         end
       end
 
-      if h[:all]
-        (BISON_REPORTS - NOT_SUPPORTED_REPORTS).each do |r|
-          h[r.to_sym] = true
-        end
-
-        h.delete(:all)
-      end
-
       return h
     end
 
+    def aliased_report_option(opt)
+      (ALIASED_REPORTS[opt.to_sym] || opt).to_sym
+    end
+
     VALID_TRACES = %w[
       none locations scan parse automaton bitsets
       closure grammar rules actions resource
diff --git a/spec/lrama/option_parser_spec.rb b/spec/lrama/option_parser_spec.rb
index 9fb294a7..e4d7ed98 100644
--- a/spec/lrama/option_parser_spec.rb
+++ b/spec/lrama/option_parser_spec.rb
@@ -54,7 +54,7 @@
           Output:
               -H, --header=[FILE]              also produce a header file named FILE
               -d                               also produce a header file
-              -r, --report=THINGS              also produce details on the automaton
+              -r, --report=REPORTS             also produce details on the automaton
                   --report-file=FILE           also produce details on the automaton output to a file named FILE
               -o, --output=FILE                leave output to FILE
                   --trace=THINGS               also output trace logs at runtime
@@ -67,8 +67,17 @@
               -V, --version                    output version information and exit
               -h, --help                       display this help and exit
 
-          Valid Reports:
-              states itemsets lookaheads solved counterexamples all rules terms verbose
+          REPORTS is a list of comma-separated words that can include:
+              states                           describe the states
+              itemsets                         complete the core item sets with their closure
+              lookaheads                       explicitly associate lookahead tokens to items
+              solved                           describe shift/reduce conflicts solving
+              counterexamples, cex             generate conflict counterexamples
+              rules                            list unused rules
+              terms                            list unused terminals
+              verbose                          report detailed internal state and analysis results
+              all                              include all the above reports
+              none                             disable all reports
 
           Valid Traces:
               none locations scan parse automaton bitsets closure grammar rules actions resource sets muscles tools m4-early m4 skeleton time ielr cex all
@@ -81,21 +90,43 @@
   describe "#validate_report" do
     let(:option_parser) { Lrama::OptionParser.new }
 
-    describe "valid options are passed" do
+    context "when no options are passed" do
+      it "returns option hash with grammar flag enabled" do
+        opts = option_parser.send(:validate_report, [])
+        expect(opts).to eq({grammar: true})
+      end
+    end
+
+    context "when valid options are passed" do
       it "returns option hash" do
         opts = option_parser.send(:validate_report, ["states", "itemsets"])
         expect(opts).to eq({grammar: true, states: true, itemsets: true})
       end
 
-      describe "all is passed" do
+      context "when cex is passed" do
+        it "returns option hash counterexamples flag enabled" do
+          opts = option_parser.send(:validate_report, ["cex"])
+          expect(opts).to eq({grammar: true, counterexamples: true})
+        end
+      end
+
+      context "when all is passed" do
         it "returns option hash all flags enabled" do
           opts = option_parser.send(:validate_report, ["all"])
           expect(opts).to eq({
             grammar: true, states: true, itemsets: true,
             lookaheads: true, solved: true, counterexamples: true,
+            rules: true, terms: true, verbose: true
           })
         end
       end
+
+      context "when none is passed" do
+        it "returns empty option hash" do
+          opts = option_parser.send(:validate_report, ["none"])
+          expect(opts).to eq({})
+        end
+      end
     end
 
     describe "invalid options are passed" do