diff --git a/src/PIL/_binary.py b/src/PIL/_binary.py
index 80c86dab8..e5ee0bf28 100644
--- a/src/PIL/_binary.py
+++ b/src/PIL/_binary.py
@@ -37,8 +37,8 @@ def i16le(c, o=0):
     """
     Converts a 2-bytes (16 bits) string to an unsigned integer.
 
-    c: string containing bytes to convert
-    o: offset of bytes to convert in string
+    :param c: string containing bytes to convert
+    :param o: offset of bytes to convert in string
     """
     return unpack_from("<H", c, o)[0]
 
@@ -47,8 +47,8 @@ def si16le(c, o=0):
     """
     Converts a 2-bytes (16 bits) string to a signed integer.
 
-    c: string containing bytes to convert
-    o: offset of bytes to convert in string
+    :param c: string containing bytes to convert
+    :param o: offset of bytes to convert in string
     """
     return unpack_from("<h", c, o)[0]
 
@@ -57,8 +57,8 @@ def i32le(c, o=0):
     """
     Converts a 4-bytes (32 bits) string to an unsigned integer.
 
-    c: string containing bytes to convert
-    o: offset of bytes to convert in string
+    :param c: string containing bytes to convert
+    :param o: offset of bytes to convert in string
     """
     return unpack_from("<I", c, o)[0]
 
@@ -67,8 +67,8 @@ def si32le(c, o=0):
     """
     Converts a 4-bytes (32 bits) string to a signed integer.
 
-    c: string containing bytes to convert
-    o: offset of bytes to convert in string
+    :param c: string containing bytes to convert
+    :param o: offset of bytes to convert in string
     """
     return unpack_from("<i", c, o)[0]