diff --git a/pycrfsuite/_dumpparser.py b/pycrfsuite/_dumpparser.py
index 7f490fe..232e036 100644
--- a/pycrfsuite/_dumpparser.py
+++ b/pycrfsuite/_dumpparser.py
@@ -48,6 +48,7 @@ def __init__(self):
         self.result = ParsedDump()
 
     def feed(self, line):
+        # type: (str) -> None
         # Strip initial ws and line terminator, but allow for ws at the end of feature names.
         line = line.lstrip().rstrip('\r\n')
         if not line:
@@ -62,18 +63,22 @@ def feed(self, line):
             getattr(self, 'parse_%s' % self.state)(line)
 
     def parse_FILEHEADER(self, line):
+        # type: (str) -> None
         m = re.match(r"(\w+): (.*)", line)
         self.result.header[m.group(1)] = m.group(2)
 
     def parse_LABELS(self, line):
+        # type: (str) -> None
         m = re.match(r"(\d+): (.*)", line)
         self.result.labels[m.group(2)] = m.group(1)
 
     def parse_ATTRIBUTES(self, line):
+        # type: (str) -> None
         m = re.match(r"(\d+): (.*)", line)
         self.result.attributes[m.group(2)] = m.group(1)
 
     def parse_TRANSITIONS(self, line):
+        # type: (str) -> None
         m = re.match(r"\(\d+\) (.+) --> (.+): ([+-]?\d+\.\d+)", line)
         from_, to_ = m.group(1), m.group(2)
         assert from_ in self.result.labels
@@ -81,6 +86,7 @@ def parse_TRANSITIONS(self, line):
         self.result.transitions[(from_, to_)] = float(m.group(3))
 
     def parse_STATE_FEATURES(self, line):
+        # type: (str) -> None
         m = re.match(r"\(\d+\) (.+) --> (.+): ([+-]?\d+\.\d+)", line)
         attr, label = m.group(1), m.group(2)
         assert attr in self.result.attributes
diff --git a/pycrfsuite/_logparser.py b/pycrfsuite/_logparser.py
index d41baee..7d05cb5 100644
--- a/pycrfsuite/_logparser.py
+++ b/pycrfsuite/_logparser.py
@@ -23,6 +23,7 @@ def __init__(self):
         self.events = []
 
     def feed(self, line):
+        # type: (str) -> None
         # if line != '\n':
         self.log.append(line)
         if self.state is None:
@@ -44,10 +45,12 @@ def last_log(self):
         return ''.join(self.log[start:end])
 
     def handle_STARTING(self, line):
+        # type: (str) -> None
         if line.startswith('Feature generation'):
             self.state = 'FEATGEN'
 
     def handle_FEATGEN(self, line):
+        # type: (str) -> str
         if line in "0123456789.10":
             self.featgen_percent += 2
             return 'featgen_progress'
@@ -63,6 +66,7 @@ def handle_FEATGEN(self, line):
             return 'featgen_end'
 
     def handle_AFTER_FEATGEN(self, line):
+        # type: (str) -> str
         if self._iteration_head(line) is not None:
             self.state = 'ITERATION'
             self.handle_ITERATION(line)
@@ -73,6 +77,7 @@ def handle_AFTER_FEATGEN(self, line):
             return 'prepare_error'
 
     def handle_ITERATION(self, line):
+        # type: (str) -> None
         if self._iteration_head(line) is not None:
             self.last_iteration = {
                 'num': self._iteration_head(line),
@@ -84,6 +89,7 @@ def handle_ITERATION(self, line):
             return 'iteration'
 
         def add_re(key, pattern, typ):
+            # type: (str,str,str) -> None
             m = re.match(pattern, line)
             if m:
                 self.last_iteration[key] = typ(m.group(1))
@@ -137,6 +143,7 @@ def add_re(key, pattern, typ):
             })
 
     def handle_AFTER_ITERATION(self, line):
+        # type: (str) -> None
         if self._iteration_head(line) is not None:
             self.state = 'ITERATION'
             return self.handle_ITERATION(line)
@@ -150,17 +157,20 @@ def handle_AFTER_ITERATION(self, line):
             return 'optimization_end'
 
     def handle_STORING(self, line):
+        # type: (str) -> None
         if line == '\n':
             return 'end'
         elif self._seconds(line):
             self.storing_seconds = self._seconds(line)
 
     def _iteration_head(self, line):
+        # type: (str) -> None
         m = re.match(r'\*{5} (?:Iteration|Epoch) #(\d+) \*{5}\n', line)
         if m:
             return int(m.group(1))
 
     def _seconds(self, line):
+        # type: (str) -> float
         m = re.match(r'Seconds required: (\d+\.\d+)', line)
         if m:
             return float(m.group(1))