diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,4 @@
+- 0.9.1.2: Update haddock for `Language.C.Inline.Interruptible.pure`.
 - 0.9.1.1: Use `unsafeDupablePerformIO` rather than `unsafePerformIO`. See issue #115 and PR #117.
 - 0.9.1.0: Add `Language.C.Inline.substitute` and `Language.C.Inline.getHaskellType`.
 - 0.9.0.0: Add support for C++ namespace and template.
diff --git a/inline-c.cabal b/inline-c.cabal
--- a/inline-c.cabal
+++ b/inline-c.cabal
@@ -1,5 +1,5 @@
 name:                inline-c
-version:             0.9.1.1
+version:             0.9.1.2
 synopsis:            Write Haskell source files including C code inline. No FFI required.
 description:         See <https://github.com/fpco/inline-c/blob/master/README.md>.
 license:             MIT
diff --git a/src/Language/C/Inline/Interruptible.hs b/src/Language/C/Inline/Interruptible.hs
--- a/src/Language/C/Inline/Interruptible.hs
+++ b/src/Language/C/Inline/Interruptible.hs
@@ -34,10 +34,16 @@
 
 -- | Variant of 'exp', for use with expressions known to have no side effects.
 --
--- BEWARE: use this function with caution, only when you know what you are
+-- __BEWARE__: Use this function with caution, only when you know what you are
 -- doing. If an expression does in fact have side-effects, then indiscriminate
 -- use of 'pure' may endanger referential transparency, and in principle even
--- type safety.
+-- type safety. Also note that the function may run more than once and that it
+-- may run in parallel with itself, given that
+-- 'System.IO.Unsafe.unsafeDupablePerformIO' is used to call the provided C
+-- code [to ensure good performance using the threaded
+-- runtime](https://github.com/fpco/inline-c/issues/115).  Please refer to the
+-- documentation for 'System.IO.Unsafe.unsafeDupablePerformIO' for more
+-- details.
 pure :: TH.QuasiQuoter
 pure = genericQuote Pure $ inlineExp TH.Interruptible