diff --git a/tivars/flash.py b/tivars/flash.py
index 05d04fb..6ec95b4 100644
--- a/tivars/flash.py
+++ b/tivars/flash.py
@@ -31,7 +31,7 @@ class BCDDate(Converter):
     """
     Converter for dates stored in four byte BCD
 
-    A date (dd, mm, yyyy) is stored in BCD as ddmmyyyy
+    A date (dd, mm, yyyy) is stored in BCD as ``ddmmyyyy``.
     """
 
     _T = tuple[int, int, int]
@@ -63,7 +63,7 @@ class BCDRevision(Converter):
     """
     Converter for revision numbers stored in two byte BCD
 
-    A revision xx.yy is stored in BCD as xxyy
+    A revision xx.yy is stored in BCD as ``xxyy``.
     """
 
     _T = str
@@ -93,6 +93,14 @@ def set(cls, value: _T, **kwargs) -> bytes:
 
 
 class FlashDevices(Converter):
+    """
+    Converter for the device field of a flash header
+
+    The device field contains at least one device type and type ID pair (xx, yy), stored as ``xxyy`.
+    A flash header usually contains only has one pair in this field; the remainder of the field is null-padded.
+    The exception is a `TILicense`, which can hold licenses for multiple devices.
+    """
+
     _T = list[tuple[int, int]]
 
     @classmethod
diff --git a/tivars/types/flash.py b/tivars/types/flash.py
index 65eeeb9..181c79c 100644
--- a/tivars/types/flash.py
+++ b/tivars/types/flash.py
@@ -1,9 +1,18 @@
+"""
+Flash types
+"""
+
+
 from tivars.data import *
 from tivars.flash import TIFlashHeader
 from tivars.models import *
 
 
 class TIOperatingSystem(TIFlashHeader, register=True):
+    """
+    Parser for operating systems (OSes)
+    """
+
     extensions = {
         None: "8eu",
         TI_82A: "82u",
@@ -17,6 +26,10 @@ class TIOperatingSystem(TIFlashHeader, register=True):
 
 
 class TIApp(TIFlashHeader, register=True):
+    """
+    Parser for apps
+    """
+
     extensions = {
         None: "8ek",
         TI_83P: "8xk",
@@ -28,6 +41,12 @@ class TIApp(TIFlashHeader, register=True):
 
 
 class TICertificate(TIFlashHeader, register=True):
+    """
+    Parser for certificate files
+
+    To date, no external certificate files have been found in the wild.
+    """
+
     extensions = {
         None: "8eq",
         TI_83P: "8xq",
@@ -39,6 +58,12 @@ class TICertificate(TIFlashHeader, register=True):
 
 
 class TILicense(TIFlashHeader, register=True):
+    """
+    Parser for licenses
+
+    A license is simply a string containing the TI license agreement, possibly spanning multiple devices and languages.
+    """
+
     extensions = {
         None: "8eu",
         TI_82A: "82u",