diff --git a/README.md b/README.md
index e499214f..04128d9c 100644
--- a/README.md
+++ b/README.md
@@ -104,10 +104,12 @@ On top of stock YADR:
 
 ## Rainbow output (lolcat)
 
-`zsh/lolcat.zsh` wires [lolcat](https://github.com/busyloop/lolcat) (Debian's
-`/usr/games/lolcat`, busyloop's Ruby build) into a few shell helpers. lolcat
-auto-detects a tty — it colorizes straight to the terminal but passes text
-through plain when piped onward, so use `-f`/`--force` to colorize mid-pipeline.
+`zsh/lolcat.zsh` wires lolcat into a few shell helpers. Works with either build:
+Debian's [busyloop/lolcat](https://github.com/busyloop/lolcat) (Ruby,
+`/usr/games/lolcat`) or the faster [jaseg/lolcat](https://github.com/jaseg/lolcat)
+(C) when built and placed ahead on PATH (`/usr/local/bin/lolcat`). Both auto-detect
+a tty — they colorize straight to the terminal but pass text through plain when
+piped onward, so use `-f`/`--force` to colorize mid-pipeline.
 
 ### Opt-in, per command
 
diff --git a/zsh/lolcat.zsh b/zsh/lolcat.zsh
index 88a8d269..8208668d 100644
--- a/zsh/lolcat.zsh
+++ b/zsh/lolcat.zsh
@@ -1,6 +1,8 @@
 # zsh/lolcat.zsh (drunkendotfiles) — auto-sourced via ~/.zshrc: for f in ~/.yadr/zsh/*.zsh
-# Rainbow-output helpers built on lolcat (Debian's "lolcat" pkg = busyloop's Ruby
-# build at /usr/games/lolcat; upstream github.com/busyloop/lolcat).
+# Rainbow-output helpers built on lolcat. Active build is jaseg's C lolcat at
+# /usr/local/bin/lolcat (faster; built from source, ahead of Debian's busyloop
+# Ruby /usr/games/lolcat on PATH). Both support -f/--force-color + tty
+# auto-detect, so these helpers work with either.
 # This lolcat is truecolor and auto-detects a tty: it colorizes when writing
 # straight to the terminal, but passes text through UNcolored when piped onward,
 # so use -f/--force to colorize in the middle of a pipeline.