diff --git a/Cargo.lock b/Cargo.lock
index b3859b1..6f229a6 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -225,7 +225,7 @@ dependencies = [
 
 [[package]]
 name = "ucg"
-version = "0.1.7"
+version = "0.1.8"
 dependencies = [
  "bencher 0.1.5 (registry+https://github.com/rust-lang/crates.io-index)",
  "clap 2.26.2 (registry+https://github.com/rust-lang/crates.io-index)",
diff --git a/Cargo.toml b/Cargo.toml
index 27f754b..27265ef 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name        = "ucg"
-version     = "0.1.7"
+version     = "0.1.8"
 authors     = ["Jeremy Wall <jeremy@marzhillstudios.com>"]
 description = "A configuration generation grammar."
 repository  = "https://github.com/zaphar/ucg"
diff --git a/src/lib.rs b/src/lib.rs
index ce4331c..0f5b0bc 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -339,9 +339,9 @@
 //! A filter expression starts with the filter keyword followed by the name of a macro with exactly
 //! one argument, a `.`, and the name of the output field for the macro. The filter will apply the
 //! macro to each element of the list and if the output field is a value that is not NULL then the
-//! list element is appended to the output list. If the output field returns a NULL Value then the
-//! element is not appended to the output list. If the output field does not exist in the macro it
-//! will be a compile error.
+//! list element is appended to the output list. If the output field returns a NULL Value or Boolean
+//! false then the element is not appended to the output list. If the output field does not exist in
+//! the macro it will be a compile error.
 //!
 //! ```ucg
 //! let list = ["foo", "bar", "foo", "bar"];