diff --git a/esphomeyaml/config.py b/esphomeyaml/config.py
index 629ce0794..4a3bc68fe 100644
--- a/esphomeyaml/config.py
+++ b/esphomeyaml/config.py
@@ -175,7 +175,7 @@ def validate_config(config):
         dependencies = getattr(component, 'DEPENDENCIES', [])
         for dependency in dependencies:
             if dependency not in _ALL_COMPONENTS:
-                result.add_error(u"Component {} requires {}".format(domain, dependency))
+                result.add_error(u"Component {} requires component {}".format(domain, dependency))
                 success = False
         if not success:
             continue
@@ -209,8 +209,8 @@ def validate_config(config):
             dependencies = getattr(platform, 'DEPENDENCIES', [])
             for dependency in dependencies:
                 if dependency not in _ALL_COMPONENTS:
-                    result.add_error(u"Platform {}.{} requires {}".format(domain, p_name,
-                                                                          dependency))
+                    result.add_error(u"Platform {}.{} requires component {}".format(domain, p_name,
+                                                                                    dependency))
                     success = False
             if not success:
                 continue
diff --git a/esphomeyaml/pins.py b/esphomeyaml/pins.py
index 38bb97a9f..0521de44c 100644
--- a/esphomeyaml/pins.py
+++ b/esphomeyaml/pins.py
@@ -205,12 +205,12 @@ def shorthand_input_pin(value):
 PCF8574_OUTPUT_PIN_SCHEMA = vol.Schema({
     vol.Required(CONF_PCF8574): cv.use_variable_id(pcf8574.PCF8574Component),
     vol.Required(CONF_NUMBER): vol.Coerce(int),
-    vol.Optional(CONF_MODE): vol.All(vol.Upper, "OUTPUT"),
+    vol.Optional(CONF_MODE): vol.All(vol.Upper, cv.one_of("OUTPUT")),
     vol.Optional(CONF_INVERTED, default=False): cv.boolean,
 })
 
 PCF8574_INPUT_PIN_SCHEMA = PCF8574_OUTPUT_PIN_SCHEMA.extend({
-    vol.Optional(CONF_MODE): vol.All(vol.Upper, vol.Any("INPUT", "INPUT_PULLUP")),
+    vol.Optional(CONF_MODE): vol.All(vol.Upper, cv.one_of("INPUT", "INPUT_PULLUP")),
 })