diff --git a/doc/api/zlib.md b/doc/api/zlib.md
index a3695eb8991ece..f159cb140fabc8 100644
--- a/doc/api/zlib.md
+++ b/doc/api/zlib.md
@@ -615,7 +615,6 @@ Allowed flush values.
 * `zlib.constants.Z_FULL_FLUSH`
 * `zlib.constants.Z_FINISH`
 * `zlib.constants.Z_BLOCK`
-* `zlib.constants.Z_TREES`
 
 Return codes for the compression/decompression functions. Negative
 values are errors, positive values are used for special but normal
diff --git a/lib/zlib.js b/lib/zlib.js
index 058e03c7180620..031c44c68061d1 100644
--- a/lib/zlib.js
+++ b/lib/zlib.js
@@ -304,7 +304,7 @@ ZlibBase.prototype._final = function(callback) {
 // This is currently only used to figure out which flush flag to use for the
 // last chunk.
 // Roughly, the following holds:
-// Z_NO_FLUSH (< Z_TREES) < Z_BLOCK < Z_PARTIAL_FLUSH <
+// Z_NO_FLUSH < Z_BLOCK < Z_PARTIAL_FLUSH <
 //     Z_SYNC_FLUSH < Z_FULL_FLUSH < Z_FINISH
 const flushiness = [];
 const kFlushFlagList = [Z_NO_FLUSH, Z_BLOCK, Z_PARTIAL_FLUSH,