diff --git a/md_pdf/build/__init__.py b/md_pdf/build/__init__.py
index 177216b..6b94e00 100644
--- a/md_pdf/build/__init__.py
+++ b/md_pdf/build/__init__.py
@@ -11,7 +11,7 @@ import time
 logger = logging.getLogger(__file__)
 
 
-def build(config):
+def build(config: dict):
     logger.debug("Starting Build...")
     start_time = time.time()
     data = read_files(os.path.abspath(config['input']))
diff --git a/md_pdf/build/context.py b/md_pdf/build/context.py
index 2e2f018..958caec 100644
--- a/md_pdf/build/context.py
+++ b/md_pdf/build/context.py
@@ -19,14 +19,14 @@ EXTRA_CONTEXT = {
 }
 
 
-def get_context(config, content):
+def get_context(config: dict, content: str) -> dict:
     config = config.copy()
     if 'context' in config:
         context = config['context'].copy()
         del config['context']
     else:
         context = {}
-    context = dict(
+    merged_context = dict(
         config,
         **EXTRA_CONTEXT,
         **context,
@@ -35,11 +35,11 @@ def get_context(config, content):
         }
     )
     if config.get('show_word_count'):
-        context['word_count'] = word_count(get_plain_text(content))
+        merged_context['word_count'] = word_count(get_plain_text(content))
     if config.get('submission_date'):
         if type(config['submission_date']) in [datetime.date, datetime.datetime, datetime.time]:
             submission_date = config['submission_date']
         else:
             submission_date = parser.parse(config['submission_date'])
-        context['submission_date'] = submission_date.strftime(DATE_FORMAT)
-    return context
+        merged_context['submission_date'] = submission_date.strftime(DATE_FORMAT)
+    return merged_context
diff --git a/md_pdf/build/jinja.py b/md_pdf/build/jinja.py
index d5f0687..2b068de 100644
--- a/md_pdf/build/jinja.py
+++ b/md_pdf/build/jinja.py
@@ -1,7 +1,7 @@
 from jinja2 import Environment
 
 
-def render_content(content, context):
+def render_content(content: str, context: dict) -> str:
     env = Environment(
         autoescape=True,
         trim_blocks=True,
diff --git a/md_pdf/build/md.py b/md_pdf/build/md.py
index 93ba6a0..d08729d 100644
--- a/md_pdf/build/md.py
+++ b/md_pdf/build/md.py
@@ -1,12 +1,13 @@
 import glob
+from typing import Generator, List
 
 
-def get_files_content(filenames):
+def get_files_content(filenames: List[str]) -> Generator[str, None, None]:
     for filename in filenames:
         with open(filename) as f:
             yield f.read()
 
 
-def read_files(files_glob):
+def read_files(files_glob: str) -> str:
     filenames = sorted(glob.glob(files_glob))
     return '\n'.join(list(get_files_content(filenames)))
diff --git a/md_pdf/build/pandoc.py b/md_pdf/build/pandoc.py
index 1c7ab2d..7fd4362 100644
--- a/md_pdf/build/pandoc.py
+++ b/md_pdf/build/pandoc.py
@@ -6,13 +6,13 @@ import logging
 logger = logging.getLogger(__file__)
 
 
-def output_html(html, out_dir):
+def output_html(html: str, out_dir: str):
     logger.info("Outputting HTML...")
     with open(os.path.join(out_dir, 'output.html'), 'w') as f:
         f.write(html)
 
 
-def build_document(files_content, bibliography):
+def build_document(files_content: str, bibliography: dict) -> str:
     args = [
         '-s',
     ]
diff --git a/md_pdf/build/pdf.py b/md_pdf/build/pdf.py
index 40200a0..9fe4612 100644
--- a/md_pdf/build/pdf.py
+++ b/md_pdf/build/pdf.py
@@ -33,7 +33,7 @@ PDF_OPTIONS = {
 }
 
 
-def export_pdf(content, config):
+def export_pdf(content: str, config: dict) -> dict:
     if logger.getEffectiveLevel() > logging.DEBUG:
         PDF_OPTIONS['quiet'] = ""
     PDF_OPTIONS['title'] = config.get('title', 'Output')
diff --git a/md_pdf/build/templates.py b/md_pdf/build/templates.py
index e0cf1f0..e62966c 100644
--- a/md_pdf/build/templates.py
+++ b/md_pdf/build/templates.py
@@ -11,7 +11,7 @@ FILE_NAME_FORMAT = os.path.join(TEMPLATES_DIR, "{}.html")
 TEMPLATE_FORMAT = os.path.join(INTERNAL_TEMPLATES_DIR, "{}-template.html")
 
 
-def render_page(input_file, output_file, context):
+def render_page(input_file: str, output_file: str, context: dict) -> str:
     logger.debug("Rendering {}...".format(os.path.splitext(os.path.basename(output_file))[0].title()))
     with open(input_file) as f:
         content = render_content(f.read(), context)
@@ -20,7 +20,7 @@ def render_page(input_file, output_file, context):
         return content
 
 
-def render_templates(config, content):
+def render_templates(config: dict, content: str):
     context = get_context(config, content)
     for template in [
         'cover',
diff --git a/md_pdf/config/read.py b/md_pdf/config/read.py
index 27eb42e..6950fe1 100644
--- a/md_pdf/config/read.py
+++ b/md_pdf/config/read.py
@@ -3,7 +3,7 @@ from md_pdf.consts import CONFIG_FILE
 from md_pdf.exceptions import ConfigValidationException
 
 
-def load_config(location=CONFIG_FILE):
+def load_config(location: str=CONFIG_FILE) -> str:
     try:
         with open(location) as f:
             return yaml.safe_load(f)
diff --git a/md_pdf/utils.py b/md_pdf/utils.py
index 4c39d48..33dc229 100644
--- a/md_pdf/utils.py
+++ b/md_pdf/utils.py
@@ -2,11 +2,13 @@ import shutil
 import os
 import logging
 from bs4 import BeautifulSoup
+from typing import List
+
 
 logger = logging.getLogger(__file__)
 
 
-def remove_dir(dir):
+def remove_dir(dir: str):
     logger.debug("Removing directory {}.".format(dir))
     try:
         shutil.rmtree(dir)
@@ -15,14 +17,14 @@ def remove_dir(dir):
         pass
 
 
-def safe_list_get(l, idx, default):
+def safe_list_get(l: List, idx: int, default):
     try:
         return l[idx]
     except IndexError:
         return default
 
 
-def get_plain_text(content):
+def get_plain_text(content: str) -> str:
     soup = BeautifulSoup(content, 'html.parser')
     body = soup.find('body')
     if body is None: