diff --git a/CHANGELOG.md b/CHANGELOG.md
index fad6ee0e..eae87527 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,6 @@
 ## Version 0.3 (in progress)
 
+* Added `->requires`, `->excludes`, and `->envname` from plumbum
 * More tests for Help strings, improvements in formatting
 * Support type and set syntax in positionals help strings
 * Added help groups, with `->group("name")` syntax
diff --git a/include/CLI/App.hpp b/include/CLI/App.hpp
index bc4c0f37..51fd8444 100644
--- a/include/CLI/App.hpp
+++ b/include/CLI/App.hpp
@@ -417,11 +417,11 @@ public:
                 throw RequiredError(opt->get_name());
             // Requires
             for (const Option* opt_req : opt->_requires)
-                if (opt_req->count() == 0)
+                if (opt->count() > 0 && opt_req->count() == 0)
                     throw RequiresError(opt->get_name(), opt_req->get_name());
             // Excludes
             for (const Option* opt_ex : opt->_excludes)
-                if (opt_ex->count() != 0)
+                if (opt->count() > 0 && opt_ex->count() != 0)
                     throw ExcludesError(opt->get_name(), opt_ex->get_name());
         }
 
diff --git a/tests/AppTest.cpp b/tests/AppTest.cpp
index b43d77eb..16325630 100644
--- a/tests/AppTest.cpp
+++ b/tests/AppTest.cpp
@@ -353,6 +353,119 @@ TEST_F(TApp, VectorFancyOpts) {
     EXPECT_THROW(run(), CLI::ParseError);
 }
 
+TEST_F(TApp, RequiresFlags) {
+    CLI::Option* opt = app.add_flag("-s,--string");
+    app.add_flag("--both")->requires(opt);
+
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"-s"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"-s", "--both"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--both"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+}
 
 
-// TODO: add tests for requires, excludes, envname
+TEST_F(TApp, ExcludesFlags) {
+    CLI::Option* opt = app.add_flag("-s,--string");
+    app.add_flag("--nostr")->excludes(opt);
+
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"-s"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--nostr"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--nostr", "-s"};
+    EXPECT_THROW(run(), CLI::ExcludesError);
+
+    app.reset();
+    args = {"--string", "--nostr"};
+    EXPECT_THROW(run(), CLI::ExcludesError);
+}
+
+
+TEST_F(TApp, RequiresMultiFlags) {
+    CLI::Option* opt1 = app.add_flag("--opt1");
+    CLI::Option* opt2 = app.add_flag("--opt2");
+    CLI::Option* opt3 = app.add_flag("--opt3");
+    app.add_flag("--optall")->requires(opt1, opt2, opt3);
+
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--opt1"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--opt2"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--optall"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+
+    app.reset();
+    args = {"--optall", "--opt1"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+
+    app.reset();
+    args = {"--optall", "--opt2", "--opt1"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+
+    app.reset();
+    args = {"--optall", "--opt1", "--opt2", "--opt3"};
+    EXPECT_NO_THROW(run());
+}
+
+TEST_F(TApp, RequiresChainedFlags) {
+    CLI::Option* opt1 = app.add_flag("--opt1");
+    CLI::Option* opt2 = app.add_flag("--opt2")->requires(opt1);
+    app.add_flag("--opt3")->requires(opt2);
+
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--opt1"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--opt2"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+
+    app.reset();
+    args = {"--opt3"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+
+    app.reset();
+    args = {"--opt3", "--opt2"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+
+    app.reset();
+    args = {"--opt3", "--opt1"};
+    EXPECT_THROW(run(), CLI::RequiresError);
+
+    app.reset();
+    args = {"--opt2", "--opt1"};
+    EXPECT_NO_THROW(run());
+
+    app.reset();
+    args = {"--opt1", "--opt2", "--opt3"};
+    EXPECT_NO_THROW(run());
+}
+
+
+
+// TODO: add tests for envname