diff --git a/lib/protobuf/dsl.ex b/lib/protobuf/dsl.ex
index 12067ef0..1e89484d 100644
--- a/lib/protobuf/dsl.ex
+++ b/lib/protobuf/dsl.ex
@@ -254,11 +254,11 @@ defmodule Protobuf.DSL do
         _ ->
           raise CompileError, """
           Transform module #{inspect(unquote(transform_module_ast))} not available
-          during protobuf definition compilation.
+          during Protobuf definition compilation.
 
-          Since protobuf v0.14, protobuf definitions depend in compile time on
+          Since Protobuf v0.14, Protobuf definitions depend in compile time on
           their transform modules. This means that transform modules can't depend
-          on protobuf structs, and must be available for compilation when protobuf
+          on Protobuf structs, and must be available for compilation when Protobuf
           definitions are compiled.
           """
       end
diff --git a/lib/protobuf/transform_module.ex b/lib/protobuf/transform_module.ex
index 05ef14c9..76fe066d 100644
--- a/lib/protobuf/transform_module.ex
+++ b/lib/protobuf/transform_module.ex
@@ -62,7 +62,7 @@ defmodule Protobuf.TransformModule do
   @callback decode(message(), type()) :: value()
 
   @doc """
-  Transforms the typespec for modules using this transformer
+  Transforms the typespec for modules using this transformer.
 
   If this callback is not present, the default typespec will be used.
   """