diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -7,17 +7,15 @@
 refers to the `ByteString` parsing input, which has pinned contiguous data, and also to the library internals, which avoids indirections and heap allocations
 whenever possible.
 
-## LLVM flag
-
-`flatparse` by default builds with the [`-fllvm` option](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/codegens.html#llvm-code-generator-fllvm). You can disable this by turning off the `llvm` package flag. Using a [`cabal.project` file](https://cabal.readthedocs.io/en/latest/cabal-project.html#cfg-field-constraints), this is most conveniently done by adding the following:
-
-    constraints: flatparse -llvm
-
-[Using `stack.yaml`](https://docs.haskellstack.org/en/stable/yaml_configuration/#flags), you can add the following:
+### LLVM
 
-    flags:
-      flatparse:
-        llvm: false
+It is advised to build with [`-fllvm`
+option](https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/codegens.html#llvm-code-generator-fllvm)
+when using this package, since that can result in significant speedups (20-40%
+from what I've seen). Additionally, you can enable `-fllvm` for `flatparse`
+specifically by enabling the `llvm` package flag. However, this has minor
+impact, since almost all parser code will be typically inlined into modules
+outside `flatparse`, and compiled there.
 
 ## Features and non-features
 
diff --git a/flatparse.cabal b/flatparse.cabal
--- a/flatparse.cabal
+++ b/flatparse.cabal
@@ -5,7 +5,7 @@
 -- see: https://github.com/sol/hpack
 
 name:           flatparse
-version:        0.3.0.2
+version:        0.3.0.3
 synopsis:       High-performance parsing from strict bytestrings
 description:    @Flatparse@ is a high-performance parsing library, focusing on programming languages and
                 human-readable data formats. See the README for more information:
@@ -38,8 +38,8 @@
 
 flag llvm
   description: use llvm for building
-  manual: False
-  default: True
+  manual: True
+  default: False
 
 library
   exposed-modules: